Hotech field flattener back focus The self centering mechanism is well thought out. Im aware of the Astro-Tech and Hotech versions of 1x flatteners but Id really like something that just screws on to the 63mm focuser (like Aug 8, 2016 · Field flattener and focal reducer - posted in Beginning Deep Sky Imaging: Im hoping to get some advice on which field flattener focal reducer to use in my f 7. Fully multi-coated two-element high efficiency flattener lens The back focus of a 2-inch SCA T-Adapter is 19 mm (0. It’s been working really well and is well reviewed by others here on CN. 6 system for faster and wider field astronomical and terrestrial photography Jan 2, 2019 · Field Flatteners for Explore Scientific refractors - posted in Beginning Deep Sky Imaging: Hello All,I have been pondering the purchase of a field flattener for my ES102ED. Im currently using the TSFLAT2 from Teleskop-Service for my Astro-Physics Stowaway (old). Aug 26, 2024 · Page 1 of 2 - Risingcam IMX571 backfocus and Hotech flattener - posted in Experienced Deep Sky Imaging: The backfocus on my setup: ED102 scope, Hotech field flattener, RC IMX571 OSC is the backfocus of the camera, 17. Can anyone help? Camera: Rebel T5i Field Flattener : https://explorescienns-for-ed-apo-s going to be getting a Astronomik CLS CDD clip in filter if that Focal Reducer/Field Flattener for SV70T 70 mm f-6 triplet apochromat. I need the back focus requirement for the William Optics Gran Turismo 81 paired with the 1:1 FLAT73A field flattener. When threaded on the field flattener, the filter will not affect back focus. 5 refractor 5-inch for photography. It will also slide into a 2” focuser for earlier model SV70ED's. Featuring fully multi-coated elements and a short profile design, it maximizes light transmission and flatness over a crisp wide field without reducers. The all-around adjustable tightness rubber contact damps unwanted vibrations from the telescope provides you a sturdy attachment on your telescope for a stable image capture. Anyone using this FF? The stars in the corners are not round, any advice? 125 minute total exposure. Jul 16, 2013 · A long hard search for a flattener that would work with my F6. 25 extension tube that came with the camera, I estimate the extension of the tube to achieve focus at 11. Many flatteners will change the focal length of the system, but with this one from Hotech, it will stay the same. 5mm back focus on the ASi294MC Pro (all extensions came included with the camera, including a 0mm M48 to M42 adapter). Jun 27, 2017 · Field Flattener for Borg 76ED - posted in Refractors : I have a Borg 76ED that I recently tried imaging with using my Nikon D5300 (APS-C sensor). Using a Moonlite autofocuser and a 2" Hotech field flattener. They do make wide T-rings with 48mm thread, which can help reduce vignetting depending on your set up and what sensor size you have. Explore Scientific’s 2” field Aug 12, 2022 · Field Flattener help - posted in Beginning Deep Sky Imaging: I have a Orion ED80T-CF with a Hotech field flattener, and a IR modified Canon 60D. By attaching a field flattener to the back of the telescope, astrophotographers can significantly reduce or completely remove coma, astigmatism, and Oct 11, 2020 · Focus with field flattener - posted in Beginning Deep Sky Imaging: Hi all, Heres the context for my question. 5) and it does a very good job. Good even illumination - can be used with full format sensors; Generous back focus distance of between 108mm to 128mm - depends on the focal length of the telescope Aug 31, 2021 · Back Focus requirement number needed: WO GT81 + FLAT73A - posted in Beginning Deep Sky Imaging: Dear all, I have a question and would really appreciate it if yall can help. mine is 1" long the focuser back out about half way Oct 31, 2015 · New Scope, WO81 and Field Flattener. I have taken a few successful stacks of photos, and definitely see the field curvature, as expected. SCA Brings your Camera to the Closest Optical Axis in the Drawtube/Visual back for BEST Imaging Result Jan 13, 2019 · I went with the Hotech SCA Field Flattener. T-rings are usually set up to give you 55mm backspacing with your DSLR. Can backfocus be adjusted with spacers (or my t Jun 26, 2022 · The camera side of the flattener provides an M42 male thread so I used a ring adapter to make it an M48 thread. I used this image to confirm focus was roughly the same both with and without the field flattener (FF). I have the William Optics 6AIII, which is a 0. I also knew from hearing from some prior to buying a refractor that I would need a FF/FR to Oct 30, 2022 · In your particular case on the Esprit 120, the included Field Flattener does have a back focus of 75mm as you mentioned, but also comes with a 20mm long adapter that results in an M48 male connection on the camera side. The DSLR and T-ring adapter have the 55mm back focus the Hotech calls for, but due The SCA Field Flattener is designed for this purpose. 5" extension tube too long. Test daylight focus object 1 mile. I got the back focus very close for my Nikon Z6. The flattener produces wonderful flat fields as well as a 41mm image circle. 5" inch focuser? I have the Explore Scientific 127mm f/7. 8x focal reducer converts the 854mm focal length f/7 refractor into a 683. Can anyone help please. The flattener threads into the Stellarvue 2. 8x reducer/flattener, and have used it successfully for about a year of imaging. I had to buy a M48 to M42 t-adapter to get the flattener connected to the camera. make it not possible to focus? or will focus but wouldn't correct the whole field? The non-reducer flattener's back focus distance, T-Thread shoulder to the CCD chip, requirement is 55mm. Twist to adjust, then lock it in place. SCA Field Flattener has built-in standard 2”/48mm (M48-P0. My ASI1600MM camera has 6. - posted in Beginning Deep Sky Imaging: AT60Gs guide scope and ZWO120mm-s used with a Hotech field flattener. 1mm back focus, but the Evoguide 50ED FF requires 17. Nov 17, 2010 · I use the SV with a TMB130SS F/7 and the Hotech Field Flattener with an Aries 127mm F/7. 0x field flattener to use with my AT90CFT f6 triplet refractor. 5" Hex Focuser - 510366 Link This TS FLAT2 Field Flattener is designed for APO/ED and Fraunhofer refractor telescopes with focal ratios of f/4 to f/9. The recommendation from the vendor is to have 55mm spacing between the focal plan or image sensor and the flattener. This is to be measured from the shoulder of the flattener (where the male T thread begins). Target: Double Cluster. Beginner Question - posted in Beginning Deep Sky Imaging: I received a new William Optics 81 f5. Individual frames were taken both at prime focus (top) and with the addition of a Hotech SCA Field Flattener (bottom). I know Hutech has had field flatteners in the past, but I am having trouble finding anyone who sells them, and some of them arent even on their inventory list anymore. This field flattener is fully multi-coated on two-element lens allowing the most efficient light transmission without sacrificing the precious collected light from your telescope. 10 Second exposures to ensure there was no impact from less than Apr 22, 2024 · ED127 Field Flattener - posted in Beginning Deep Sky Imaging: Hey all, wanted some feedback on Field Flattener/Reducer for the ED127. FF only. A fine 0. So, after running some FocusMaxv-curves and getting the focus set, I wanted to see how 44 Astronomy TECHNOLOGY TODAY HOTECH SCA FIELD FLATTENER Image 1: The Hotech SCA Field Flattener is attached to a Borg 125SD equipped with a Feather Touch focuser and supports a QSI583ws camera via two 10-mm spacers. Feb 18, 2020 · Hotech went silent and did not get back to me in the end. 7x Focal Reducer - FFFR507X-00 is what I am using on mine Link You will also need this Explore Scientific Adapter for FFFR507X-00 to 2. If you have specific recommendations Id Feb 16, 2024 · Page 1 of 2 - Non-Reducing Field Flattener Question - posted in Beginning Deep Sky Imaging: Hi everyone, when I got my Astro-Tech AT80ED telescope, I also bought the AT AT2FF non-reducing field flattener, which has worked well for me on the AT80ED. 7x focal reducer would be good, but it is made for a 6 inch f8 achro. Focus was achieved with BYEOS. The sensor to front of T-ring is 55mm. Anyone use this combination? currently using the 1. I read these are the same optically as the AT2FF. It is yet another dream come true for imagers! HoTech SCA Field Flattener 2" High Quality Optics Designed for Refractor Telescopes The HoTech SCA Field Flattener 2" is fully multi-coated on two-element lens allowing the most efficient light transmission without sacrificing the precious collected light from your telescope. The flattener's back-focus requirement is 55mm (2. The field flattener requires a spacing of 55mm from the attachment point to the sensor plane. The 2" Field Flattener Accepts 2" Filter Thread Jan 2, 2019 · The self centering feature works really well. I also have the ASI1600MM Pro Kit which needs to be put together as shown: Now. 5 years ago) and quickly realized how awesome the night sky is. 17") from the male T-thread to the CCD chip on your camera. The telescope was fixed (non-tracking) -- the objective end was resting on a rock wall, while the camera end sat on a low tripod. Boring, I know. Since it is an OTA only, what other accessories will I need? Im not talking about mounts, cameras, etc. It is optimised for DSLR cameras and telescopes with f/5-f/7 focal ratios. 7 reducer/flattener but also wanted just a flattener in case I was shooting something that I wanted more focal length. 8mm of the 55mm, which means you're 1. My my father is letting me borrow his ED80, so I can get some wider FOV shots than with my C8. Im looking for specifics to the OTA to ensure I can accomplish both objectives. First light image attached. F 7. Two-Element Design; Fully Multi-Coated Optics; 28mm Imaging Circle; 6º Pinpoint Stars; Back Focus 17. I have read that this field flattener is very forgiving as far as spacing goes. To that flattener male thread attaches the OAG, FW, and camera (which are all bolted together). This cut the curvature distortion by about half. Features & Specification. All normal and good there. The threads on Dec 15, 2022 · Hotech 2" Field Flattener - posted in Beginning Deep Sky Imaging: First image with the Hotech 2 Self-Centering Field Flattener. I have also installed a Moonlite focuser. Is anyone currently using this combination? It looks like just what Id want from a configuration standpoint but I dont know if it would serve the intended purpose. With a 5mm thick T-EOS adapter, the back focus is Feb 7, 2020 · The recommended back focus from the Flat61A field flattener to the imaging camera is 55mm, which was achieved using a 11mm+21mm+16. I have an Orion ED80T-CF with a Canon 60D, and a Hotech field flattener in the middle. According to ZWO, the length form the sensor to the threads is 17. I ordered the ES . Jun 28, 2024 · Focus issue with Explore Scientific ED127 and ASI2600mc pro duo - posted in Beginning Deep Sky Imaging: Hey all, bought an ED127 five years ago and have only now gotten around to using it. I decided to try my hand at CCD imaging this past October and after reading some reviews in S&T, I made the leap. 45mm for a 55mm back focus. With the Hotech 2" SCA Field Flattener, you'll see clear, crisp images over the entire field. Im using the hotech field flattener at 55 back focus. Any issues taken at best focus in the center of the frame (left), just inside this focus point (middle) and at best focus but from the corner of an APS-sized frame (right). The slight deviations from round here are the result of thermal Jul 7, 2022 · This video describes how easy it is to modify and install the Hotech Field Flattener onto the William Optics GT71 telescope. The Astro-Tech 60ED 1x flattener easily threads on to the focuser of your AT60ED after your remove the standard compression ring eyepiece holder. I purchased the ES ED8 Jul 14, 2010 · The SCA T-Adapter center loads your camera in the drawtube/visual back with a simple threading of a compression ring forcing the built-in rubber rings outward radially, thereby centering the camera in the drawtube/visual back for optimal installation. " It looks like that's the one you're using, and that you're using the M42 adapter -- so that takes up 1. 5” A version focuser. The images looked great, except for some epic field curvature. Jun 27, 2020 · What is causing my elongated/out of focus stars? - posted in Beginning Deep Sky Imaging: Hello everyone, Before I start I will list my gear below: - HEQ5 Pro - Astro Modified (possibly important, get to that later) Canon T3i - T ring adapter - Hotech 1x Field Flattener - Meade 6000 80MM Apo Triplet - L- Enhance Filter - ZWO EAF Anyway, Last night I was testing out all of my equipment and Apr 15, 2020 · Yes, t ring direct to back of hotech flattener. The Hotech gives me great star shapes to all edges of the frame when using a dslr whereas the WO left a lot of curvature through the frame accentuated I have a Hotech SCA field flattener , a Explore Scientific ES 80 and a full spectrum modified (IR filter completely removed) Canon 450D, and a… The William Optics 0. I also have a moonlight focuser. But this was only to test the effectiveness of the field flattener. I believe that this is just a backfocus distance issue But I have not found info. There will be a technical follow up video which discusses pros and cons of Flattener/Reducer c Aug 15, 2019 · The Explore Scientific 3" Field Flattener . Right now, I'm using the TSFlat72 which is specifically made for the TSAPO72 (essentially the same scope as mine). 5 Triplet ED APO with 2. Removing the compression rings on Apr 9, 2021 · I have tried one field flattener/focal reducer that I could never get a decent result with; fine adjustment of the back focus distance would yield stars that had features of being too far inside and too far outside both at the same time with my best attempt: either blobs pointing in or blobs circling around, with blobs doing both when I had the Oh gosh this is more complicated than I imagined damn🥲, I clicked that link and I hate to see it, there’s different back focus per different telescopes gah, damn, at least that flattener specified the required backfocus distance per telecope, the problem I’m having is, I’m trying to pair a field flattener with my telecope, Mar 15, 2021 · Out of the box, after snugging down a few screws that were holding the focus assembly in place, I was good to go. However, whenever I can, I Jan 24, 2013 · 2 Barrel extender to fit HoTech Field Flattener - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: Hi, can anyone out there give me directions on where to find a 2" barrel extender with male thread to fit into 48mm female threaded end on my 2" HoTech field flattener and provide an additional 20mm back focus which Iam short of. Steve at Ontario telescopes consulted Gary Palmer who said he gap distance on the flattener/reducer must be 3. i bought a ts optics 3inch rack and pin focuser but havent put it on yet. then, how the images would look like? those 3mm of the sensor being too close to the FF would it. I'm installing the Hotech SCA Field Flattener for F/5 to F/8 refractors in my Explore Scientific F/7 ED102 scope. Optional adapter: Also available as an optional purchase is the 36 mm adapter which provides about 55 mm of back focus when used with a 102 - 115 mm f-7 refractor. SCA Damps Vibration. I understand that WO recommends me to use it with the 0. Read technical details at our Photo Gallery . 25 mm thick with a working length of 1. It works great! We also discuss the effect of filters on the back focus. 5mm short of that and I have nice round stars all the way to the edges. I have an ED127 as the scope. The 2" Field Flattener Accepts 2" Filter Thread. My thought is Oct 28, 2018 · You're correct. Feb 19, 2019 · Field flattener for ED80 - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: Hello friends, and thanks in advance. and a longer back focus length. The scope i Mar 15, 2020 · Field Flattener options for Orion 80mm ED CF - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: Hi everyone, I recently purchased my first telescope (Orion 130ST 1. im guessing the tension screw is too tight maybe. 7x Focal Reducer - FFFR507X-00 Explore Scientific 3" Field Flattener . I have been struggling with elongated stars in the corners, and am wondering if I should try a different field flattener, or if I am expecting too much from this scope. Full sized image https://flic. And since my light Feb 17, 2011 · A newbies lesson learned on field flatteners - posted in Experienced Deep Sky Imaging: I was a DSLR only guy until a poor filter conversion by an outside party ruined my canon for AP work. 5mm extensions along with the 6. I’ve added a 4mm spacer between flattener and camera (recommended by NINA aberration Jan 11, 2023 · AT72EDII, ASI2600MC-PRO, HOTECH Field Flattener Questions - posted in Beginning Deep Sky Imaging: Team, I recently acquired the camera and field flattener documented in the title. SCA Damps Vibration The all-around adjustable tightness rubber contact damps unwanted vibrations from the telescope provides you a sturdy attachment on your telescope for a stable image capture. 0x flattener for my GT81. So heres the question. 8. kr/p/2o1tyuk WO Zenithstar 73mm ASI533MC Hotech Field Flattener Optolong L-Pro Filter iOptron CEM40 back-focus, so I attached two 10-mm exten-sion tubes to get the necessary additional 20 The Hotech SCA Field Flattener is attached to a Borg 125SD equipped with a Dec 28, 2019 · Field flattener spacing for AT72EDII - posted in Beginning Deep Sky Imaging: Ive got an AT72EDII and Canon T3i DSLR. I think it is still available. 8X focal reduction converts the 70 mm f-6 to a 336 mm f-4. Instructions say 55mm back focus which I have achieved with the included spacers (21mm, 16. My introduction to AP started by placing my iPhone against my 25mm eye piece, and realizing how incredible it was that I could capture Saturn Dec 5, 2015 · Strange. The M42x0. I believe I need to add spacers, but Im not sure how much spacing is required. 0X FF Choice for 90mm f6 triplet - posted in Experienced Deep Sky Imaging: Im looking for a 1. Dual flexible rubber contact rings automatically center and secure the flattener I found the Hotech SCA Field Flattener to be a well-made, well-designed unit and I would 46 Astronomy TECHNOLOGY TODAY HOTECH SCA FIELD FLATTENER Image 3: Flat-field plot produced by CCDInspectorusing the Hotech flattener. I have read that it is 45mm but unsure how to check the spacing for my imaging train. The specified backfocus is 55mm which I have set up, but correction is not optimal—I still see stars elongated at the edges pointing to the respective corners. It is suitable for refractor telescopes with focal ratios from 1:8 to 1:5 and, if the optics itself is good, you will see bright and sharp image across the entire field. 7mm) Internal Diameter; M42x0. The aforementioned field flattener slips into the Nov 27, 2017 · Back-focus distance - posted in Beginning Deep Sky Imaging: Hey all, I would like to know what kind of item do you use to achieve the back focus with your camera and field flattener? i prefer if you include your post with photos so i can see. 0. I have a Hotech SCA field flattener, and the T-ring I've always used with everything else screws directly on the threads that are covered with the metal screw-on cap. :-) So in the EdgeHD 11’s case, the “back focus” is something like 146mm, not 55mm. The SCA FFL accommodates f/5 to f/8 refractor telescope providing sharp Oct 8, 2021 · It’s that 55mm happens to be a common, BUT NOT UNIVERSAL, “back focus” distance from flat field optical train to sensor. Still waiting on the flange from precise parts. I am not able to achieve focus as the focus tube goes all the way in and does not get to focus. Hotech says their back focus distance is 19mm. . delivering an impressive 72x magnification without compromising field flatness to offer bright, clear images throughout the entire field. The T-ring adds 9 mm, so with the 46 mm flange-focal distance of my DSLR, the sensor ends up at the desired distance of 55 mm from the the flattener. When I try and focus the draw tube Sep 24, 2019 · Explore Scientific Field Flattener - posted in Equipment (No astrophotography): Hello, Im having issues with getting the backfocus on my field flattener. No category Hotech SCA Field Flattener A field flattener, also known as a field corrector, is an accessory used in astrophotography that helps to eliminate optical aberrations caused by the curvature of the telescope's focal plane. It is my understanding that the Canon EOS has 44mm distance from the lens flange to the sensor plane. The Hotech SCA Field Flattener was an excellent match. T-ring thread accepts all kinds of 35mm cameras. 75) filter thread. 5 with - posted in Beginning Deep Sky Imaging: I am interested in investing in that telescope with a Hotech 2 SCA Self-Centering Field Flattener If somebody has a similar system, I would appreciate your feedback (happy/not happy) and if you have a back focus distance from the flattener. 71-inch) measured from drawtube shoulder to the bottom T-Thread. If can't focus, slide out about 1/2" hotech from focuser. 2. 75 Exterior Thread (T2) Green Anodised Aluminium Screw-on End Caps; Net Weight Sep 6, 2021 · FWIW, I use the Orion field flattener on my ED80 (600mm/f7. Jan 3, 2015 · The images obtained via the Hotech field flattener are noticeably better than the ones via the Stellarvue flattener. I was so stunned that it actually worked at its published 55mm backfocus that I kinda ignored I was still having curvature issues in the outer 15% of the image, in Jul 9, 2020 · TLDR? The Explore Scientific 2 inch Field Flattener with marked back focus distance of 55mm is a terrible, terrible match for the Explore Scientific ED80 FCD100 APO telescope. It’s designed for scopes between F/5 -F/7. 5mm back focus and the filter wheel is a total of 20mm thick. Features. 5mm). This all-in-one reducer/flattener lowers the focal length by 0. 5 FWHM on a bright center star. Jul 31, 2019 · Having issues with my Hotech SCA filed flattener on my ES 102 f/7 refractor and QHY247 camera. Im thinking the 3-inch explore scientific field flattener 0. If I put any more distance between the flattener and camera I can’t achieve focus. I do have an off-axis reflection issue I need to deal with, but I think I know how to do that. 25-inch SCA T-Adapter is 18 mm (0. As a matter of fact, I think I saw a IDAS lps d1 on the classifieds here a couple of days ago. While it does a good job (I think) in flattening the field, it does introduce chromatism Jan 11, 2023 · Your reducer specifies a backfocus of 55mm. Provides an evenly illuminated flat field. Post-processing: Identical procedures for both images. Nov 20, 2018 · Focus: Bahtinov mask on star in center of field. Thanks The non-reducer flattener back focus distance, T-Thread shoulder to the CCD chip, requirement is 55mm. If so, then either one should work fine? I also heard about the Hotech 2 Mar 11, 2020 · This useful non-reducing Field Flattener enables DSLR astrophotography with most f/5-f/7 refractor telescopes. may find that you do not quite come Telescope Camera Adapter for Astrophotographers. I decided to get this non-reducing flattener. Nov 29, 2021 · Hotech 2" SCA Flattener - Initial Impressions - posted in Beginning Deep Sky Imaging: If you dont want to read the whole post, theres a short pros/cons list at the end For quite a while Ive been considering picking up a 1. I am using a Canon 500d. However, I usually encounter issues when using this with my larger Astro-Tech AT130EDT APO. 5mm scale makes accurate positioning easy. The instructions call for 55mm of back focus but I’m 1. So I am trying to figure the back focus distance total. This reducer/flattener is optimized for our 70 mm triplet lens. Sep 1, 2022 · Help me pick a field flattener for my ED80 - posted in Beginning Deep Sky Imaging: So I have the Explore Scientific ED80 triplet essential series, and its finally up and running. Mike Sep 24, 2022 · Backspace requirement Hotech field flattener. I have Hotech FF and i connect it to the camera, and then this FF is connected to an extension tube [80mm] which is connected/attached to the focuser of Apr 10, 2021 · Focus issues - posted in Equipment (No astrophotography): I may know the answer to this but thought asking here would either confirm or set me straight. 8mm too far out with The exposures were made with a Nikon D700 camera at ISO 200, using a 600-mm f/7 "home-made" refractor (the objective is from a Tele Vue 85, with a "low-profile" focuser and a HoTech field flattener). 5" the HEX Focuser Oct 23, 2023 · 1. 9 Scope this week along with the included . Just simple adjustments in GIMP. 5. 9 William Optics Megrez 90 led me to try the Hotech SCA field flattener after a fairly dismal performance from the WO FF/FR III. I dont want too Sep 22, 2020 · NEW SkyWatcher Field Flattener for Evoguide 50 ED. 5mm. It will also work well with telescope focal lengths narrowly outside this optimised f/range if using an astronomy camera with a smaller sensor. This totals to 55mm so I figured that was in This 2" field flattener, a fully multi-coated two-element lens, produces the highest light transmission efficiency without giving up any valuable light your telescope has gathered. im gonna have a QHY183c camera, and a 2 HOTECH SCA Field Flattener, then FF ties to the 2 inch plug into my ES-ED80 Mar 29, 2021 · Backfocus for the ES 127 FCD100 F7. Mar 4, 2021 · For instance, my QHY8L has 20. Apr 1, 2021 · This is a new scope and it is collimated or i thought. Apr 8, 2020 · Standard T-rings are usually 42mm thread. The combination produces significant field curvature, so Ive added a Hotech SCA field flattener. Edited by neaptide, 02 January 2019 - 05:54 PM. I have an explore scientific ar102 refractor that I am trying to hook up an asi224mc camera to along with the hotech field flattener. It accomodates f5 to f8 refractor telescope This thread on field flattener for the AT60ED is a must for full frame photography. Can anyone with Feb 1, 2018 · Page 1 of 2 - Best Field Flattener/ Reducer for ES 80mm APO - posted in Beginning Deep Sky Imaging: What would be a nice Focal reducer/ Field Flattener for the ES 80mm with my 1600mm-c Pro? I have the Hotech SCA flattener but doesnt seem to be a good match ( Made sure the backfocus is close to or at 55mm). Maybe I could improve it a little bit but I'm honestly not sure it would be worth the effort. The 2" Field Flattener Accepts 2" Filter Thread The exposures were made with a Nikon D700 camera at ISO 200, using a 600-mm f/7 refractor and a HoTech field flattener. I wanted the AT2FF model but they are out of stock. I found the Hotech SCA Field Flattener to be a well-made, well-designed unit and I would 46 Astronomy TECHNOLOGY TODAY HOTECH SCA FIELD FLATTENER Image 3: Flat-field plot produced by CCDInspectorusing the Hotech flattener. So now Im looking at the orion and the ES field flatteners. I have ZWO ASI2600mc pro duo, a Hotech SCA field flattener with a 16. If the camera has a much longer back focus, say 65 mm, you will need to remove one or more of the extensions that came with the field flattener assembly and replace them with shorter extensions. It’s the optics that has the “back focus” requirement, not the camera. 5 mm everything looked good with my ASI294 PRO. He’s mentioned, and I’ve read, that I’d probably want to use a field flattener with the ED80 if I’m going to do imaging. The extensions needed are our M69 extensions. It is not an FR. Eliminates Drawtube & Visual Back Slop Thank you for purchasing the state-of-the-art HOTECH SCA Field Flattener for your camera. Through experimentation, you can find the best back focus for your particular scope and then tweak it to achieve optimum field flatness across the entire image. 72x Reducer/Flattener 8 is a high-quality equipment item created to improve your experience in astrophotography. It's working beautifully with the scope and after some trials and errors, I get almost perfect stars in every corner. 2mm f/5. My camera is a zwo294 mc pro and my scope is an Explore Scientific ed80apo and my electronic focusser is a zwo EAF. 8 mm. 0. With this adjustable field flattener, changing back focus distance is easy. I currently use a 0. Your 5100 -> t ring -> flattener with filter threaded on -> focuser is a dependable set up Mar 10, 2023 · AT115EDT with Svbony SV209 1x Field Flattener - posted in Beginning Deep Sky Imaging: Hi all. 25" (31. 8x FF/R and a 1. Nov 30, 2022 · Imaging train sag and mechanical interface limitations - posted in Beginning Deep Sky Imaging: I have been struggling somewhat with my setup, and some of the issues seem to be around how the equipment links together. I can’t attach the 16. 5mm; 1. Actually pretty much my first image. I want to add a rotator to the setup, but I dont have enough back Jan 16, 2011 · I am looking at getting a Hotech SCA 2" field flattener for my 80mm refractor. 75-inch) and 1. 8x reducer/flattener with my gen 1 AT-66ED and AT-80ED. This adapter Sep 30, 2020 · Does anyone use or know if it is possible to use the Hotech SCA field flattener with a 2. The reason for Jun 16, 2019 · Hotech 2" SCA field flattener - posted in Beginning Deep Sky Imaging: Maybe a question especially to Stelios, as he recommends it quite often - but likely more people here are using it, and can give some info there. I am not sure what camera sensor size you are planning to use, if 4/3, that will be easier than APS-C, full frame will be very hard and I assume you are not going to use a Oct 13, 2019 · If it is, the web site says: "The field flattener/focal reducer offers 55 mm of back focus from the rear flange. I attached the camera to the filter wheel, screwed in the T2-T2 adapter and 11mm ring but at this point I’ve run into a problem. Will also provide much improved results on refractors with focal lengths narrowly outside this optimised f/range. My problem is the back focus of the field flattener is only 51. Hopefully you know that so sorry if already clear. Back-focus from the rear of the flattener is about 86 mm for long focus refractors to 107 mm for short focus refractors. I did not have the exact spacers to achieve this but at 53. im going to test that tonight. Have my modified canon 350D rebel connected Sep 16, 2020 · Confirming Back focus on QHY183c - posted in Beginning Deep Sky Imaging: So i just opened up my new/used (thanks to this site) QHY183c. More contrast overall, and better sharpness over the whole camera sensor field of view, especially in the corners. Here is my quandary:The ES field flatteners are specialized for Canon or Nikon, I own Pentaxs. Before I spend another $ 200 was wondering if someone can give me valuable advice on Apr 13, 2021 · A high-quality, non-focal-reducing Field Flattener optimised for DSLR imaging on refractor telescopes with focal ratios around f/5. Sep 9, 2014 · I am trying to figure optimum back focus for my set up. - SCA Eliminates Drawtube/Visual Back Slop - SCA Eliminates unstable locking from thumbscrew or unified compression ring Sep 9, 2020 · For the Orion Field Flattener, I never used it before and on the FLT 91, only thing to look forward to is playing with the back spacing to get a flat field for your setup. Superb optics and reliable SCA adapter for f/5 to f/8 refractor. 75 adapter is 6. First night out last night and the results were pretty poor. The stars are not acceptable without the reducer/flattener. 5 is not too slow, the first I was looking at just flattener. Is it perfect at the far corners? No, but it's pretty darn good in my opinion. 8x reducer instead. I think I am just making sure i have my thought process down for my imaging train. Sep 7, 2019 · Attaching Field Flattener - posted in Beginning Deep Sky Imaging: So I’ve bought a HoTech 2’’ Field Flattener which requires 55mm back focus distance. 5 to f6. The instructions specified 55mm of back focus. As someone noted above, it is the optics that determine what the required backfocus is, not the camera (and when a reducer/flattener is used, it is that device’s specification you reference), although the camera will consume a portion of that backfocus in terms of how far back the sensor is from the face of the camera (where it couples with the 2" SCA Field Flattener with T-Thread. The Hotech 2” SCA Self-Centering Field Flattener is an innovative accessory integrating high-grade optics with a built-in drawtube adapter for refractors. Dec 22, 2017 · Field flattener back focus - posted in Beginning Deep Sky Imaging: I am using an Orion EON 130mm ED Triplett refractor scope and Orion proprietary field flattener with a Canon EOS 70D for astrophotography. 5 +/- 5 mm and the flange to sensor distance in the Canon dslr is 44 mm. 5 mm Mar 7, 2020 · This video is just the physical exchange of these components. Works with f/5 to f/8 refractors. Feb 5, 2021 · Page 1 of 2 - Astro-Tech 115 - What Else Do I Need? - posted in Refractors : Im planning on purchasing an AT115 some time this year (hopefully) for both visual and AP use. I saw a ES feild flattener only so I got that, but realized its for f5-f7 refactors only and the ED127 is a f7. SV209 field flattener can correct the defect of field curvature of the user's shooting target; improve the imaging quality and shooting efficiency of the edge of the field of view ; SV209 0. There seems to be quite a bit of variability in my measured tilt based on how I put things Nov 29, 2021 · To get sharp stars across the viewing plan, I choose to buy a Hotech 2'' Field Flattener (read a lot of discussion here and settled for it). I purchased a Hotech field flattener/reducer and measuring with my digital vernier I got the back focus to 55 mm from the back of the Hotech but cannot achieve anything like focus. In this case you will need to shorten the extensions by 10 mm so the field flattener assembly has a back focus of 65 mm, matching the camera. 0x Hotech FF. Convientiely when bolted together this ZWO configuration makes exactly 55mm of back focus which is what the Hotech flattener calls for. Jul 28, 2020 · After a terrible experience with an Explore Scientific 55mm field flattener I could never get to correct any of the field curvature of my ED80 I finally switched to a Hotech SCA. 5 mm and 21 mm spacer between the camera and flattener. jyyxe zpkaom qybpur uxmmv gdxxao zprbmf qfigb vsvpqc mmry kul ygin makn zoezcma wcpqpia irtj