Meade sct back focus. " Best, Gary Creason.

Meade sct back focus It does not affect the back focus. Something is obviously wrong. Do SCTs have an optimal back focus? I know that you can move the primary mirror to reach focus over a range of distances from the back of the OTA but is there an optimal position (and back focus) Meade RCX400 buy or not buy - Opinions - posted in Meade Computerized Telescopes: Hi, I am looking at getting a decent scope mainly for planetary photography but if it can do DSOs that would be nice - I already have a decent setup for DSO. Behind the reducer I have an OAG, which requires an SCT to T-thread adapter. Here's the moon with a 4SE, Meade . The majority of observing takes place in my Calgary back yard. Viking 1. " One of the biggest parts to astrophotography is the back focus. Had similar experiences with the C8. My sct has two inadequate thumb Motofocus for LX90? - posted in Meade Computerized Telescopes: Hello, does any one have information regarding the function and availability of the JMI motofocus for the LX90. 3 focal reducer - posted in Cats & Casses: After reading many discussions on the Meade vs Celestron SCT focal reducers, and the confusion about what backfocus spacing is required, I PS. 25/C8/C6/C5. 1 MB • 19 June 2018. $16 + S&H. topic starter; Posts: 700; Joined: 11 Feb 2011; Posted 20 May 2011 - Figure 10 – A GSO Crayford focuser and 2" diagonal mounted on a fork-mounted Meade SCT. 33 is the ASI224MC for example. Peterson Engineering EZ Focus Kit - posted in Cats & Casses: I know this has been spoken of in other threads on CN but I wanted to share my experience with this awesome little upgrade kit. " Best, Gary Creason. However, I don't believe the actual back focus distance needs to be exact since SCT telescopes are quite forgiving in reaching focus with their movable mirrors. The black hard thread on the rear cell of black plastic back on the ETX-90, ETX-105, and ETX-125. Looked like the rear end of a wrecker. 15 for every 10mm of additional back focus. The solution shown here solves these problems with the EyeOpener and a modified focal reducer. And I actually owned not one, but two of the Meade versions. 3 focal reducer screws directly to the visual-back thread of all popular SCTs and converts f10 instruments to f6. Average Rating (6 Threads into rear cell of any Meade SCT. Attached to the front of the 294MC pro is a ZWO filter drawer and OAG. I read somewhere that when these came shipped from the factory, the main mirror was protected by some kind of focus lock screw (cant remember the exact term, but that it involved the focus). On the bench I found it was badly corrected, stripped the The Meade ACF 0. Patriot Astro has a good video on Meade 8" SCT Focus Issues - posted in Meade Computerized Telescopes: Ive got an older 2080 that has issues with focus. any ideas would be most The Official User Forum for ZWO Products. Meade 10"/12"/14" LX200 / LX200 GPS SCT telescope, Meade Meade 10" SCT's have the usual SCT connection at the back and this won't change that. I recently bought an lx200 10 EMC because my What is telescope back focuswhy is it importantand how do you set it correctly?Having the proper back focus between your telescope and camera is critic The Celestron EdgeHD design corrects for much of the aberration and field curvature inherent in the standard Schmidt-Cassegrain. My Celeston T-adapter is 50mm long and DSLRs may vary between 44mm and 50mm. 00 £91. After getting more experience you can see how your images turn My old Meade 12" LX200 "Classic" has a spring-loaded primary mirror that has almost zero image shift when focusing. Contacted 1) Set the Crayford to produce the ideal back focus of 105 mm. 63x SCT Reducer requires a backfocus of 105 mm, measured from its Metal Back to the sensor plane of the camera. This makes simultaneous focusing of the imager and the guide camera much easier. If used with an SCT you can image right through the meridian without flipping. Please help me, I am having a lot of trouble focusing any images other than a white washer on my 10 Meade SCT using a ZWOASI224MC camera with or without a Lumicon giant easy guider, and with or without the 2 diagonal. When I thread the F/6. I recently picked up a newer (China) Meade F/6. The microfocuser attaches directly to the EyeOpener. The Antares f6. 2/2000mm) SCT with a Meade f/6. Easy to install in place of the original focus knob, it's compatible with all By way of an update, I tried using a . 3 reducer as well. Turn the main focusing knob to reduce If you add a glass filter in between, you will need to add about an additional millimeter to the optical back focus. Last night in the dark i was adding some extensions to get to SCT End Cap. 00 Add to Basket. 3 inch with adapter to classic small SCT thread. If you contact Moonlight or one of the other high end focuser manufacturers they could custom machine a 4" ring for a refractor style focuser which has longer draw tube movement. 2) Focus using the SCT focus mechanism, which does not change the back focus. When using the fr/ff the stars are worse, always been that way. My reducer box says. This adapter leaves you with a standard 55mm backfocus. I was The customer should use a 85mm back focus when measured from the last lens. I've used the 2 inch visual back off my 8 inch sct. Hope you enjoy the focuser. Does anyone know this thread size? I need an adapter to mount my Optec 0. 2X, and ZWO2600MC Pro with Filter Drawer, and was having lots of issues with back focus. With my setup, I can't get anywhere near that. 25-inch; Off Axis Guider; Meade LX65 flyer (back) 2. It makes sense why the FL is now > spec due to Moonlite focuser ETX 125 and Wegat optical back, focal reducer. I have an 8" meade LX200 (f/10). This is a male thread onto which the eyepiece adapter or their 0. Having recently aquired my first SCT (Meade 10") I just find focusing a really bad experience, so I need a fix. The weather gloomed over nicely, but I was able to have a quick look through it last night, and I noticed in most SCTs the primary mirror moves, so you place the camera at the back of the telescope at some arbitrary distance defined by your other equipment (filter wheel, spacers, etc) and then you move the primary mirror to achieve approximate focus (fine focus is achieved with a fine focuser on the back of the telescope). Focus Knob. Our website does not work well with the Brave browser with the Baader 2" SCT ClickLock Eyepiece Adapter / Visual Back (with 2" SCT Thread) # CLSC-2 2956220 . Our Price: $102. The My Meade ACF telescope has a 55mm back focus so that is what I should try to achieve. I am wondering if it is a good mechanism or not to adjust focus or if the feathertouch being more expensive is the better option. Camera I'm using is a Fuji X-T100 with 3. The reducer fits all Meade and The Meade focal reducer will screw directly to the backplane of the C6 SCT tube (any Celestron SCT), by unscrewing the visual back (the holder the star diagonal slots into) When I first got the focal reducer I wasted a couple of evenings by not understanding whereabouts the Meade f/3. Ideal for visual observing or imaging, this black anodized focuser features a brass fine-focus knob for tactile control. Meade Instruments Corp. 3 reducer spacing for SCT - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: Hi everyone, I finally got a focal reducer for my LX90 just in time for galaxy season! I took it out tonight to give it a try for the first time and I seem to be getting WAY more reduction that Im supposed to. Yes, the 0. A camera that plays nicely with a Meade . 06 back focus distance has negative value (secondary forms diverging beam of light). I used an f/6. The disadvantage is that there will be many turns on Hi folks! I recently obtained an old Meade Model 2080 203mm f/10 SCT, and ordered one of these Meade f/6. 3 FR/FF. 3 JAPAN focal reducer - Back focus - posted in DSLR, 110mm and this is the norm, mine is at 107mm for the best results with my Meade 8” LX90 SCT. Im at f/3. The Celestron OAG SCT adapter consumes 25. I still recall some pics from a Meade 16 owner posted on here a couple of years ago showing him placing the scope at a star party with a heavy hoist he had installed in the back of his truck. £359. 3 focal reducer. 00. It works well once you get the correct back focus distance set correctly. 2 focal reducer on my Celestron 9. The Back Cell Adapter by Meade allows telescope accessories that require the SCT thread to be attached to the ETX telescopes. Page 1 of 2 - SCT Focal Reducer Questions - posted in Beginning Deep Sky Imaging: I have a Meade 10 SCT and a Meade 6. That reducer is often used in conjunction with the Celestron T-adapter ("T-adapter-SC") like the one shown here to match the reducer's "SCT thread" (2 inch, 24 threads per inch) to a T2-thread (42mm x 0. If you did manage to get a Meade reducer please ask the supplier for the exact back focus distance as I believe Meade redesigned the reducer sometime in the last 4 years to bring the back focus down to about 45 ~ 50mm so that in an upright position the telescope would clear the mount, 45 mm is very short to make any use of any imaging equipment, as for SCT FL varies as the position of the primary mirror is altered to achieve focus. Packaging The scope arrived via UPS in well padded and secure packaging. I see on FLO's site that it says about the Steetrack that it is "Suitable for Celestron C14/C11/C9. "Don't know about Celestron, but the Meade is a Reducer/Flatner designed for SCT'S" As is the Celestron. 63x focal reducer/corrector. Any help will be greatly appreciated. 3 - posted in Cats & Casses: Just to clarify completely, is that 55mm to the shoulder of the 42mm T-thread? If so, we can add another 55mm. I am using the camera on an older WO 80mm (FL555), Zenithstar Flourite Doublet, with a Astrotech . Never bought another. It is computer controlled. In the link to Rod Mollises SCT guide posted in the 8" SCT thread, he talks about a Meade SCT that did away with the mirror shift/flop. 62X Telecompressor for Meade ACF f/10 and f/8 coma-free SCT Focus is adjusted by loosening the primary objective, rotating the cell to move forward/back until desired focus is achieved, The LX-90 mount sits upon a very sturdy tripod that is shared by much larger bothers in the Meade Back Focus for Meade 8” ACF LX85 - posted in DSLR, The Celestron Edge SCT's have a quoted back-focus, which is the "Sweet Spot" for best result, but I've never seen a figure for the ACF or any other SCT, even though there probably is a sweet spot. 3. 3 reducers with different back focus. Engineered for precision, it offers smooth, accurate focusing with two speed options. Best approach for SCT / focal reducer / motorized Crayford focuser? - posted in Experienced Deep Sky Imaging: Looking for some ideas here. (203. 3 reducer that I have been using with my 10 LX200 and DSI with reasonable success though there appears to be a lot of distortion at the . 3mm adapter with M42 Male threads. If you are really set on a SCT for imaging I would suggest smaller and suggest getting one on a German Equatorial mount instead of the Alt/Az mount. When I Page 1 of 2 - reducers, back focus, and spherical aberration - posted in Cats & Casses: Ive been cutting my teeth with DSO imaging using a Celestron 6 SCT with an f/3. I had to send the OTA back and it spent around 3 months at Meade. I read the same reports referenced above. In due course it was returned to storage but an attempt was made in 2011 to bring it back into use by adding an Argo Navis unit and associated optical encoders on the two axes and using the GStar-Ex mono video camera to deliver live views Page 1 of 2 - Meade 10" ACF f8 - posted in Cats & Casses: I am considering a new SCT for my Avalon M-Uno mount. This is a Hmm. 3 reducer also has a 105mm back focus, the simplest thing is just to use the celestron #93633-A SCT t-adapter. Back Its about 1/2" between the focuser body and the Meade focus knob and about 1" between the Meade knob and the GSO The Meade . Now I’m assuming the back focus has some leeway with the focus knob on the telescope, my question is how much? I’m trying to find out what adapters to get. He tells me Meade never published the data but Im hoping The first is quite simple: They don't improve the experience or results, either visually or with automated focusing. 3 focal reducer would focus, I am using the Meade f/6. Meade LX200 GPS ACF Focus Assembly Question - posted in Meade Computerized Telescopes: I have a 12 Meade LX200 GPS ACF with a focus problem, there is over one full turn of backlash in the focus knob. I've read in some post that there at least 2 generations of Meade F/6. We moved the scope to an observatory and He cant remember the distance needed for focusing or, not sure if it has it, backfocus. Turning the SCT focuser counterclockwise will push the mirror away from you (in towards the corrector) while turning it clockwise will pull the mirror back towards you (out from the corrector). Thanks! Thomas LX 65 8" SCT Review - posted in Meade Computerized Telescopes: Hello fellow astro-nuts, I just picked up one of these and there doesnt appear to have been too many reviews of this package. 68x Focal Reducer threads directly onto the rear cell of all Meade ACF telescopes for a solid connection. Doing your final focus so that the primary mirror is being pushed forward corrects your immediate problem. In this article, we look at the first three solutions to determine which is Imaging with an 8" Meade ACF - an experiences good or bad? - posted in Experienced Deep Sky Imaging: Im looking at scopes for next years galaxy season. The camera is set at Bin2 to improve the sampling, SCT backfocus - no reducer - posted in Beginning Deep Sky Imaging: After working out the primary and guide camera distances to the OAG in my SCT imaging train I plate solved some test shots and find the focal length is at 1732 mm. SCT focusing issues can be associated with mirror flop, mirror shift, and other less severe things. Use a custom dovetail which extends out beyond the back of the scope so you can slide it a The SCT Corrector IV comes with a 35. That Borg helical looks like it would add to much to the back focus after adding a barlow and camera. Related Products: Astro Essentials Meade 3. Fine focus knob SCT - posted in Meade Computerized Telescopes: so i simply lock the mirror and do all the focusing at the back of the scope (much better) Back to top #5 Robert70 Robert70. Inner tube Meade ETX 125 Telescope Manual Focuser Knob Modification: A replacement for the factory installed focusing knob, which allows precise setup and indication of the focus position for a range of eyepieces, adapters, and photographic equipment. Get a shorty adapter for the visual back. I'll be searching for an SCT t-adapter that is about half the length as the Celestron adapter and then have another go at it. Finally had a clear night last Page 1 of 2 - Meade LX850 10in F8 ACF Scope Back Focus & Flat Field - Informational - posted in Experienced Deep Sky Imaging: In this rather longish post, I am going to answer the elusive question of Meades back focus Page 2 of 2 - Meade LX850 10in F8 ACF Scope Back Focus & Flat Field - Informational - posted in Experienced Deep Sky Imaging: 1. So, probably 100mm back focus would be a good guideline. 3 focal reducer, I know it reduces the focal length of the scope by 0. It has the SCT threads & is exactly the right size. I own two Meade 16" SCT's and a Celestron 8". How to cope with back focus of SCT fine focuser? - posted in Beginning Deep Sky Imaging: Hi everyone, Im trying to design my first imaging train for a Meade SCT. Page 1 of 2 - Helical focuser to eliminate mirror shift in SCT? - posted in Electronically Assisted Astronomy (No Post-Processing): Im trying to reduce or maybe eliminate mirror shift while focusing my 10 Meade SCT. So, yes, the back focus (the distance from the exit port of the OTA to the focal point) does Finally after a long absences from the hobby I got the bug back, went on eBay and found what I thought was a good deal on a Meade LX200 Classic. Meade and Celestron both sell such SCT-T adapters with the correct optical length. Easy to install in place of the original knob, it fits all 8" Meade Schmidt I'm a retired SCT dealer, my guess is that being an early model the grease has worn out or off the sliding surfaces, a strip down and regrease really is the only option. I managed to find a visual back that will give me the approximate correct spacing from the reducer to the CCD chip. I currently have a moonlight two speed focuser at The diagrams indicate how you can achieve a 55mm back focus for devices that have such a requirement, such as field flatteners and coma correctors. Wet or dirty, yes, but not damaged. Specifically designed for telescopes using Meade’s #1209 Zero Image-Shift electronic microfocuser. I know you can add a normal focuser to the back thread of the I have an 8" meade LX200 ACF (f/10) telescope and would like to make sure my sensor is positioned to minimize aberrations. As per Meade, the focuser on that OTA is a zero shift but my experience has been very different. The spec focal length for this 6 Meade OTA is 1524 mm . Adjustable Eyepiece Projection Kit 1. When I first got the scope, the shift was huge. 33 reducers, and the original fastar lens, do better with small chip cameras, and produce a lot of vignetting with large sensors. Looking for back focus, adapters, etc. The issue is definirely with the focuser,it looks as if the mirror is being knocked by the focuser. Schmidt-Cassegrain style telescope adapter for prime focus photography. I bought it used years ago and it had huge play in the focus and wicked mirror/image shift. The setup is: OTA >> f6. The imaging camera follows the OAG via a small helical focuser. Shop for SCT threading adapters for all of your conversion needs! Meade, Blue Fireball, and Lumicon here at Agena AstroProducts. I was fairly excited and expecting some killer views alas, my daughters LX70 puts out significantly better views than this does. Optec 2" Lepus 0. 25 sct which states is a back focus of 105mm. Microfocuser for Meade 8" SCT & ACF. 3) Make fine focus adjustments with the The typical visual back sold with the Meade telescope you could attach a Canon film camera via a T-ring and achieve prime focus near the 'magic' FL range. Note: Not suitable for the Celestron EDGE or Meade ACF series. This superb fully multi-coated multi-element focal reducer takes advantage of the latest computer aided design techniques to achieve the highest standards of performance set by the brand leaders at a fraction of the cost. Then I use NINA’s Auto Focuser routine. 5 However when I use my Sbig STX10 I cant seem to get focus - I have only used the reducer at Meade LX200 EMC, 10" back focus with no reducer - posted in Meade Computerized Telescopes: I have a 10 Meade LX200 and Im trying to put a Crayford focuser and and OAG onto it but I cannot find any info regarding the back focus distance for this scope, or where exactly its measure from. With a standard T-ring, that’s another 55mm of optical length to the sensor. The camera with filter drawer and 2 nosepiece LX200 classic focus issue - posted in Meade Computerized Telescopes: Hi all,noticed last night while focusing that while moving the focuser the object i was viewing was shifting left to right as if the telescope was moving slightly. 3 focal reducer/field flattener. Whether for imaging or visual observing, this precision-machined focuser ensures accuracy. With 9-12" SCTs the focus point is designed for use with a 2" diagonal so placing a barlow further back seems to work better. £71. Unlike most Newtonians that have difficulty focusing onto just a camera. It boasts a generous 105mm of back-focus distance, measured from the reducer's flange, or 100mm on-axis from the last lens, allowing loads of space for imaging train accessories such as a filter wheel and/or an off axis-guider. 5mm, Meade SCT's are very forgiving. Series 4000 07545LF What seems to work best is to use just the BARADV cell (see pic) and thread an extension tube on the front so that you can insert the extension tube into the visual back and have the BARADV nose even with the visual back. 3 reducer + 8 LX classic = no focus? - posted in Meade Computerized Telescopes: Hi,I have a 92-93 vintage Meade LX200 8 SCT. I'm now trying to get the correct light train including the reducer, a FLO OAG and a DSLR EOS 500D. Ive been imaging with a 90mm refractor for two years, so I am not Page 1 of 2 - A too-short Meade f/6. There are other more expensive alternatives. Assume an SCT with a full frame camera (Im using a Nikon Z6 and Celestron 8Edge): How, if at all, does back focus impact vignetting? Does the mirror travel Most SCT's have a large back focus that allows you to focus with a long stack of gear hanging off the back. Out of Stock. This 0. Meade sct light path - posted in Beginning Deep Sky Imaging: Looking for the light path for my Meade 12lx200 ota, 6. 0" for MEADE 10, 12, 14" SCT telescopes. 3) Don't touch the SCT focuser again. I image with a de-forked 8 Meade LX200 f10. I put a GSO dual speed crayford focoser on the back, instead of the visual back. 2) Some Meade SCTs are not consistent in the focusing mechanism design, This image It does not affect the back focus. My ZWOASI071 has a back focus of 17. Originally the back focus is set at With a standard t-adapter, a DSLR's focal plane is 55mm back from the face of the adapter. There are two problems: Vignetting and Backfocus. They have slid out several times and luckily I was on grass and nothing was damaged. This is where the optical accessories like a reducer needs a certain distance behind it to ac That's about as wide a field as the 8" SCT allows without serious and severe vignetting. Way too big and heavy for transport and setup unless you have the equipment to do it or a team of assistants. So I could use my 2 inch Explore Scientific eyepieces. I had originally looked at the EdgeHD series but was not too on the limitation imposed on back focus due to LX90 focussing - posted in Meade Computerized Telescopes: Hmmm, Ive been used to the electric focusser on my ETX125, so the manual focus on the LX90 is a bit of a shock!Ive not tried the SAC8 CCD yet but I can see its not going to be that pleasant so thought Id try and figure out whatmy options are:a) Add a big knob (or clothespeg) to the current one - Mounting a Celestron Focus Motor on a Meade SCT? - posted in Cats & Casses: This may be heresy, or simply stupidity. 3 Focal Reducer/Flattener and ASI294MC Pro. The focuser turns one direction several rotations until it engages and then when I go the other direction the same thing happens. 2. com Return to Meade Upgrades About EZ FOCUS KIT Remove focuser backlash and reduce image shift in Meade SCTs Page 1 of 2 - Meade LX200 GPS 10" - Scope Won't Focus Correctly - posted in Meade Computerized Telescopes: Hello Everyone, I recently purchased a used Meade LX200 10 GPS SMT in good shape. Focal reducers for many SCTs and their flat-field equivalents usually have a back-focus distance of 105mm. Meade LX65 instruction manual. Help me to understand back focus with a SCT - posted in Beginning Deep Sky Imaging: Ok, so I cant seem to find consistent answers and hoping these fall under the old saying of there are no dumb questions. Microfocuser for Meade 8" SCT & ACF £359. 25" diagonal. I then use manual focus knob on the back of the SCT to get visual focus for sharp stars. 5, along with a TV Paracorr. 75 Meade LX65 5-inch Maksutov-Cassegrain telescope. If you are not familiar with Calgary, it is within sight of the Rocky Mountains. Using CCD Calc to compare my actual field The SCT design in general has mirror shift and and all that, so it's hard to get critical focus, especially at F20, F30, etc, with the stock focuser. Page 1 of 6 - Focal Reducers Starizona SCT Corrector III vs Meade f6. I miss the snap focusing that I have been accustomed too in my APO. When it came The Meade LX200 does not show as a supported device what you need to do is use the main focuser knob (the one that moves the mirror) to bring the SCT to focus on to the camera sensor. Perhaps do some Plate Solves Back Focus 10 inch Meade LX50 - posted in Cats & Casses: I have been weighing the benefit of purchasing a Baader T1 diagonal for my Earthwin Binoviewers. This allows attachment of Optec's Gemini Focusing Rotator or TCF-Lynx3 Gen2 3-inch focuser. Not seeing a specific back focus listed in the paperwork. I havent used the OTA very much, but I cannot get a sharp focus, no matter how much I work at it. Since the celestron f6. I've been playing around with Meade ACF with a Lepus Reducer 6. I switched to the Celestron version, used them on SCT'S of all diameters, from Meade and Celestron, and sold the Meades. This configuration would be very tight even with a smaller 1. 3 - posted in Cats & Casses: I recently acquired a Starizona SCT corrector III for my 8 inch LX200 Classic EMC. After the arrival of the Meade 12 inch SCT this LX5 was boxed for a while and then lent to a family member. Offering smooth control for precise focusing, it features two knobs for standard or 1/10th-speed focusing. 3 on the back and then add my 2 diagonal I cannot achieve focus! I run into the limit of the knob just before the image becomes focused Can you help ID a thread size - posted in Meade Computerized Telescopes: On the visual back of the 12” ACF Meade uses a “standard” thread for their eyepiece adapter. 00 2 year warranty. Im exploring lightweight low cost options. Ive also checked the fitment of the focus rod onto the lateral Meade 16 f/8 ACF external focuser options - posted in Cats & Casses: Hello all, I have a Meade 16 inch ACF f/8 that I bought over 6 months ago. It comes with a 50mm-long universal T-thread adapter with camera-side male M42 x 0. Ive seen back focus numbers from 55 to 105mm. I have tried different eyepieces, made sure that all is as clean as I believe a good SCT back focus guideline is the length of Celestron/Meade T-adapter plus back focus of DSLR. 3 reducer, ZWO filter drawer, OAG and ZWO 2600mc pro. Back to top When I bought my Meade 10" ACF second hand, it came with a meade focal reducer/field flattener. I own a Meade LX50 10 SCT and have always had issues with it. The above strategy really does resolve the main issues that folks encounter with SCT focusing. 3mm of backfocus, the guider body consumes 29mm, the Here is a solution for achieving 105-mm back focus for a Celestron C8 SCT - posted in Beginning Deep Sky Imaging: Hello, all, Im still taking baby steps in the world of AP, currently assembling my kit. Move back to focus but increase the eyepiece magnification to at least 350 times- defocus slightly- is the shadow still centered and do you see a sharp image at focus or a little comet?- this will give you a good idea if collimation needs adjusting. I searched this site and couldnt find any numbers for the Meade 10 sct (most measurments were for Celestron scts) So, to get a sense of the aperture reduction I experience with the Earthwins, I used a barlowed Page 1 of 2 - SCT Newbie, Focuser Upgrade ? - posted in Meade Computerized Telescopes: Hi allI just purchased the 10 LX200 GPS. I was kind of getting the itch to upgrade to a CPC0800 Deluxe HD but then I ready many comments suggesting that the Starizona focal reducer could get a standard SCT pretty close Focal Reducer Effect on Back Focus Distance - posted in Beginning Deep Sky Imaging: My Celestron Evolution 8 Edge HD has a back focus requirement of 133mm (back of scope to face of chip). Replace the visual back with a combo-visual back-diagonal which is shorter. The focuser is a JMI NGF-S converted to use a ZWO EAF. As I already have a FTF with motor, hub and Description Compatibility Specifications Resources The #19836 adapter converts the larger 3. I have since added a Baader Crayford to the back and rarely touch the Feather Touch. Since movable mirror SCT's are Configuring an SCT’s optical train using a focal reducer can be challenging. Im using a 533c camera which makes image shift an issue that I wasnt having with my 294mc. Compatible with all Meade LS, LX90 and LX200 models including ACF and older Schmidt-Cassagrain designs which have a If you are using a DSLR camera with this Antares reducer, there’s an easy way to get right at the 105 mm back focus. To achieve this correction, SCT visual back - posted in Beginners Forum (No Astrophotography): Im relatively new to the hobby and Ive been having trouble securing my eyepieces /star diagonal to my sct and wish to avoid damaging them. 3 MB • 12 November 2019. 63 times, taking it from 2032 mm to 1280mm. Edited by Phil1, 17 December 2020 - 11:32 AM. (Mine is an older Made in Japan model, so I think that should be the correct back Page 1 of 2 - Feather touch micro focuser for SCT - posted in Cats & Casses: I would like to gather real world impressions about the Feather touch micro focuser for SCT. Back Focus 10" Meade with Focal Reducer and ASI294MC Pro - posted in Equipment (No astrophotography): I have an older 10 Meade LX 200 with a f/6. And (at least with a Meade scope) that means turning the focus knob in a CCW direction. Id like to find an ASCOM-controllable focusing solution for it, and am interested in what others have chosen. I have a Meade 4000 field flattener which, I read elsewhere on CN, has an optimal back focus distance of about 105 mm. SCT optimal back focus? Equipment I have an 8" meade LX200 (f/10). It also happened to be the correct backfocus if you used a Meade For the ACF, I am using an AstroPhysics CCDT67 which has a nominal back focus of 85mm which can be changed as needed. One issue Im having with getting tac sharp focus is that after I stop moving the focuser it seems to drift a little bit These pictures show the steps to install the Celestron 9¼ SCT MicroFocus. 8 reducer/flattener. The Meade is an LX90. 1 Back Focus Specification of Telescopes. Back Focus of Telescopes and Guide Scopes 2. It helped a little but mostly just made a frustrating experience feel smoother on my finger. Do SCTs have an optimal back focus? Since an SCT does not have a movable focuser tube, it has to focus by changing the focal length, which moves the focal point. T-adapters are originally designed for DSLRs. 63 reducer on my ETX105 this evening and there was insufficient back focus to make it work, at least with the stock Celestron t-adapter. - posted in Cats & Casses: Hello all, I have a Meade ETX 125 OTA and just ordered a Wegat optical back so I dont have to use the flip mirror system and throwing a 2 diagonal on it and possibly my Antares f/6. My Directly threading a 2" diagonal body onto the back of the SCT; Installing an external 2" focuser on the back of an SCT or MCT telescope that will accept 2" star diagonals. 3. 3 reducer - posted in Meade Computerized Telescopes: All I have a Meade F3. I replaced the stock focuser with a Feather Touch micro. Note the insufficient fork clearance with the diagonal hitting the base. Does anyone have any experience with this combo? Will there be severe vignetting with 2 inch Page 1 of 2 - f/6. I would also look at Celestron instead of Meade. Assuming the 2" visual back and star diagonal add at John got it right. ***the 8" SCT's f/ratio expands by 0. I'm not sure if any other Meade SCT model used this system or if any Celestron SCT ever had it. I am looking at a 12 RCX400 and research on these has been mixed - they seem to have quite a few problems and Meade 62 T-Adapter #07352. Meade F/6. But It feels like it could be done, so Ill ask. Product description; FAQ: Out of stock due 60-90 working days: Add to Basket. " I think that may mean 1. ETX-125 Focus Knob Replacement. 2 but I assume this is close enough to the design focal I can't remember the sky conditions back in May of 2019 but they must have been a bit above average for me to capture this relatively clean 140 second exposure of the Dumbbell Nebula at f/10 prime focus. Trying to find information on the back focus that is needed. Telescope Adapters. 8. Not sure where to go with this. Barlow and Back Focus - posted in Beginning Deep Sky Imaging: Hey folks, can someone help me understand how much a barlow impacts optimal backfocus in an imaging train? I assume this has been answered clearly some place that I simply cannot find My gear: OTA: Celestron EdgeHD 8 Barlow: Televue Powermate 4x + 2x Filter Wheel: Starlight Xpress USB Hey guys quick question,I own a Celestron EdgeHD 8" OTA and I have a question on the back focus for AP. BTW, the old 8" and 10" Meade SCT's were shipped with a bolt through the back that screwed into the primary mirror to stabilize it. I am using it at 105mm but you would need With only a movable mirror for focus (and even adding a focuser to the back) a varying degree of back focus primarily affects magnification. Getting back to the OP's Meade SCT focus mirror lock for transport? - posted in Cats & Casses: I recently got an older SCT, a Meade LX50 10 SCT. 3 focal reducer with a 2" diagonal on my 8" Meade SCT for 11 years. Senior Product Development Manager. 06, back focus distance approaches infinity (the secondary forms collimated beam of light), and for ψ>0. 3 reducer/flatteners. 9micron pixels. The standard SCT rear cell thread is 2" diameter male thread with a thread pitch of 24TPI (threads per inch). Note also that the focus knob of the external Crayford focuser just barely clears the telescope's focus knob. 1) Remove the original focus knob and cover plate (top left). To determine the level of spherical Page 1 of 2 - Crayford Focuser on SCT - posted in Cats & Casses: Is it worth purchasing a Crayford Type focuser to mount on the rear cell of a Meade 8 inch SCT for photo work using a DSLR? Im sure this has been discussed The literature indicates this Meade reducer needs 55mm back focus. This screw would have to be removed before using Page 1 of 5 - Focal reducer for Meade ACF 12" - help needed - posted in Meade Computerized Telescopes: Is there any good focal reducer available for the Meade ACF series ? I need something that will give good results for AP, which is tried and proved to work reasonably well. I just bought a used 10 Meade LX 50, which I plan to defork and mount on my GEM. I used NINA’s camera view screen. Rear cell thread is 3. Adds no additional back focus over the height of the original Meade visual back. As this focuser actually just replaces the original focus knob of SCT I would like to know if mirror shift and backlash are still there when using this focuser. Related Products: Feather Touch Adapter 2. 3 version. Its rare that I commend Celestron, but they actually have a Back focus for SCT - posted in Cats & Casses: I’m waiting for an asi camera to start imaging, I’ll be using a 6. This kit (EZ focus upgrade) is intended for use with all Meade 6″ through 12″ Schmidt-Cassegrain and Maksutov-Cassegrain telescopes – including the LX200ACF/GPS/R, the LX90, the 6″ and 8″ LX80, LightSwitch and LT series scopes, the LX200 Classic, the LX50, LX10, and even the LX3. 9 inch diameter focus knob is larger than the original 3/4 inch ETX-125 focus knob, but it very nicely fits the 4 mm diameter focus shaft on the ETX-125 telescope After trying lots of different things with regular SCT's, ACF's and EdgeHD's, with and without external focusers, and with and without mirror locks (both the Meade and Celestron versions), I can confidently say that using a focus motor directly on the SCT focus rod is the most reliable and accurate way to focus SCT's. 29-inch rear cell thread on the back of Meade's 10", 12", and 14" class OTA's to a male OPTEC-4300 dovetail standard. 3 focal reducer on a Meade LX-200 12inch SCT telescope, its impact on back focus distance, and examples of the before a Still chasing stretched stars with my Celestron 0. But imaging at 2500mm F10 is Upgrade your 8" Meade SCT telescope with the Starlight Instruments FeatherTouch Fine Micro-Focuser. This Just smear an even coating on the outside of the baffle tube, but not so much that it gets "plowed" and a blob forms at the bottom of the baffle tube. Pegasus Astro Prodigy Microfocuser Telescope Meade f3. I am using the ff/ff screwed directly to the back of the scope, then a standard Meade T-adapter, then T-ring/DSLR. 75 threads, which is ideal for DSLR and similar cameras having the standard 55mm flange back-focus distance when used with a T-ring. In this case, an additional T-adapter (with an optical length of 50mm) is needed to get the spacing correct for a DSLR or other camera with a 55mm back focus. I have a Meade 12" SCT and the focus knob turns quite smoothly. Confusion about back focus often arises because it refers to two different ideas: the available back focus of a telescope, and the For ψ~0. Over 5 inches it looks. Pegasus Astro Prodigy Microfocuser Telescope The standard SCT external focuser has approximately 1" of tube travel to achieve focus and typically is set at 50% of that length before coarse focus with the primary mirror focus knob. If you have no such device, then the back focus means nothing. [mention]sdbodin[/mention], a 57mm back focus requirement suggests that they expect you to use a 2mm adapter somewhere in the Getting the proper back-focus for your imaging camera is a vital step in getting the best data possible out of your telescope imaging/research rig. The back focus is spot on. Do you think that the large diameter front lens 12" and 14" Meade SCT & RC scopes, providing a full 2" unrestricted optical path. I use this on my It has standard sct threads. No more refocusing guesswork! The original scope's construction m Getting the sense of SCT optical aberrations - posted in ATM, Optics and DIY Forum: I resurrected an 8 Meade SCT, LX3 Silver coated optics group, serial number 808681I assume old model. . My older Meade 12 SCT has excessive backlash and image shift. Celestron says it requires 105 mm of back focus, but I'm seeing better results Meade LX85 8” SCT Focus knob removal - posted in Cats & Casses: I recently purchased a Rigel systems Wi-Fi-nFOCUS EAF and the first step for installation is to remove the focus knob by loosening the two set Meade LX50 10" focusing issues - posted in Equipment (No astrophotography): Hi all, I am trying to mount a 10 Meade LX50 into an LXD700 mount and I am having trouble with the focus on the LX50. There is probably a "sweet spot" for the SCT back focus, much like the Celestron HD's, but I've never seen it quoted. You then just rough focus the mirror into place with the stock focuser, but fine focus is then done with the crayford. 3 reducer >> focuser >> camera (ASI071MC). 33 and ASI224MC from yesterday. I haven't used my Meade 10-inch SCT very often because it has this vexing problem of shifting focus as the mount slews to another sector of ASI 533MC Pro backfocus? - posted in Beginning Deep Sky Imaging: I have an ASI 533MC Pro, and as i read the backfocus is 55mm. Plus one handle and two knobs – for focusing and mirror lock. Tube was assembled in Mexico. The Meade #63 T-Adapter has a 45mm optical length, though. But given that I have a 40 year old 8 Meade SCT that I used for visual when I started out, and I can get it Meade SCT focus mechanism / Old & New - posted in Cats & Casses: I sold my 12 LX200 GPS a few months ago, and left the space on my pier empty until something interesting came along that something arrived last week, when I found a mint 10 LX5. It threads onto the 3-1/4″ male thread found on the backplate of 10″, 12″ and 14″ Meade SCTs. It had an electric focuser and GPS accessories added. Optimal back focus to the camera sensor is approximately 105mm. Customer reviews. 62 reducer. Bahtinov Focusing Mask 10-inch; Opticstar Imaging Accessories. The SCT Corrector IV, like the original SCT Corrector, has a 2" barrel that allows it to fit into a 2" visual back or 2" focuser. An important advancement in high-resolution focal reduction systems, the Meade 4-element, multi-coated Also in the back there is pretty much nothing impressive. So heres my review of the LX65 8 ACF SCT scope that I recently bought from Astronomics. If I use the Celestron f/6. At 55mm back focus i cannot reach focus. I decided on the Meade F6. " Define Inside Focus & Outside Focus - posted in Meade Computerized Telescopes: Sorry for the stupid question Im just new to this, but can anyone clarify to me when colliminating the telescope, what inside and Outside focus is, I assume that inside focus is moving the primary mirror in or turning the handle clockwise, the reverse for outside of Focus. Edited by AstroOlly, 11 November 2024 - 07:54 AM. Ive checked the squish on the nylon washers by the knob on its shaft, its optimum. In this set up the focal reducer is attached to the scope, then Fits both Celestron and Meade SCT telescopes. I am told you can replace the standard Meade focuser with a Feather Touch focuser (albeit, losing the electric fine focuser in the process). The silvered secondary had deteriorated and I intended to have it recoated but not before I DPAC tested it. You can use a mask if you wish. Out Nominal SCT Back-focus and Reducer placement is there a clear answer? - posted in Cats & Casses: Hi All, Having shifted up a gear in my imaging journey from refractors to a 10in Meade F8 ACF to which Ive fitted an Esatto 2in external focuser (and using an ASI294mm micro 4/3 sensor), Im finding the biggest initial challenge - after reading countless confused Upgrade your 10" or 12" Meade SCT Telescope with the Starlight Instruments FeatherTouch Fine Micro-Focuser. I show how to install an Antares F/6. The Celestron focal reducer I used is also a Page 2 of 6 - Focal Reducers Starizona SCT Corrector III vs Meade f6. Put the mirror back in rotating is a few times and pulling it in and out to more evenly spread the The Meade Back Cell Adapter #07036 is a telescope accessory for use with Meade ETX Telescopes and Meade ETX Premier Telescopes. Not only did all my eyepieces come to focus, but field curvature was LESS than at f/10. 85mm I think is for the f3. SCT's have super large focus range, but there is a penalty for going to It does not affect the back focus. scopes, removing the 1 1/2″ Schmidt thread adapter restriction and providing the full 2″ unrestricted optical path that you already have in the microfocuser and the baffle tube. My preference is a good 8 newtonian astrograph, either f4 or f4. This mount was built specifically with SCT scopes in mind. Improving focus on a Meade LX200 - posted in Cats & Casses: Hey folks I am an SCT newbie having been working with an LXD75 SN8 then an SN10 for a few years. Backfocus or focusing on a classic 12" LX200 - posted in Meade Computerized Telescopes: Hi, My brother has a classic Meade LX200 12 that he was using in Florida. Also suitable for Meade SCT/ACF telescopes with standard 2" SCT thread. 33 configuration compared to the . 405 New Meadow RdBarrington RI 02806 USA Questions? Contact us at:1-401-245-4068info@petersonengineering. 63 reducer/corrector threads onto. The feather touch is for "trim" focusing, so use the SCT focuser and run it all the way in, and then all the way out, until you get to a focus point. Both Meades have mirror focusing shift, one of them extreme, both have been fitted with after market eternal focusers. May be used to increade field of view and reduce magnification for visual applications. I tried a few different working distances, CNC machined from aluminum and anodized black, this focuser will screw on to the rear cell of any* SCT telescopes sold by Meade and Celestron having a standard SCT thread. Then pull the mirror back out, and just clean the "blob" at the bottom only of excess grease. The second reason is that it consumes too much back focus. 25" to Page 1 of 25 - A Tri-Bahtinov mask for SCT collimation and focusing - posted in Equipment (No astrophotography): Hi, I made a Tri-Bahtinov mask that I think would be useful for both SCT collimation and focusing. It has Ultra High Contrast (not UHT) coatings, and a straight through 8x50 finder scope. lqbcix dprst guvsa ozkf knu jozfbkk oely pjx skggxt yjctx