Borg field flattener Reasoning behind these changes: - the newer reducer/field flattener is optimized for the 71FL and 90FL Borg 1,08x Field Flattener for Refractor Telescopes The # 7108 corrector can be used for all refractors from 300 mm to 800 mm focal length Connection thread telescope side: M57x0. The M48 fitting provides a large clear aperture to reduce halation and a precision thread ensures the triplet and doublet lens groups are precisely aligned on the optical axis perpendicular to the image. 8x or the Borg DG/L. 08x Field Flattener $ 399. 5 focal ratio TMB-92. I dont believe its a good fit. Features & Specification. This 1. Jul 16, 2013 · "The flattener lived up to the claims and now I have the ability to image at the na- tive focal length of my Borg 125SD! Overall, I found the Hotech SCA Field Flattener to be a well-made, well-designed unit and I would recommend it. The whole package seems odd and the total cost is almost as much as the telescope $400 Orion Field May 25, 2019 · The field is pretty flat compared to other scopes without flattener but pretty curved compared to other scopes with flattener. 08x Field Flattener (sells new by Hutech for $365) for $200. I know that TEC do a flattener only but I would also like a focal reducer. 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. Focal length is adjustable for use with various refractors, including non-BORG telescopes. 08x DG field flattener 7108 works with telescopes with focal length between 300 and 800mm focal length, thanks to the adjustable lens barrel. Mar 12, 2015 · Good question. (I will note there Nov 9, 2016 · BORG 55mm f3. Good condition. I am using a 15mm square chip so I dont need an immense flaat field. I have been looking for both a fast newt, as well as a shorter refractor for wide field stuff. 75 male thread Connection thread camera side: M57x0. 0x flattener features a triplet optical design that supports a 44mm full-frame image circle. Thanks in advance for any suggestions. What is the best ff/fr for a Megrez 110? Apr 21, 2013 · The Borg 125SD in visual configuration would apparently just be a two lenses up front without the two in back which act as a focal reducer and a field flattener for photography. I am a few months away from getting something in the 85mm - 90mm range and this looks tempting, IF it performs well, given comments so far. I note that this flattener states as optimal distance 128mm for under 450mm so probably more for this one as it has an even shorter focal length, so keep in mind the need for plenty of extensions and possible focuser sag unless you sort of balance everything out with Company information. William Optics Flat 73 1. Works with objectives between 300 - 800mm focal length via adjustable lens barrel Fully covers 35mm full format sensors M57 male on objective side M57 female on camera side Back focus : 55mm 40. I have not yet attached my dedicated astronomy camera and filter wheel but I am confident the adjustable flattener will enable me to reach the perfect back-focus without the need for countless spacers. 0x Field Flattener enhances the imaging capabilities of refractors by elliminating fiel curvature in short, optically fast refractors providing a flat image for the camera sensor. 8x Adjustable Reducer Flattener HK$1,780. Optional accessories: Canon 48mm T-ring; Nikon 48mm T-ring; Back Focus Adjustment Guide for ZenithStar 73 SkyWatcher EVOLUX 62 ED is an apochromatic refractor, ED doublet 62mm f/6. It is optimised for DSLR cameras and telescopes with f/5-f/7 focal ratios. Interface: M48x0. Using a field flattener is a no-brainer: just screw it at the back of your telescope or insert it in the telescope using a nosepiece. My question for those out there with the knowledge I seek is this: My understanding is I need a field flattener. Field flattener lens is a type of lens used in modern binocular designs [a] and in astronomic telescopes to improve edge sharpness. 5 mm Pentax XW, my 9 mm Lunt UWA 100° and my Meade 5. Recently I decided to upgrade to the newer field flattener/. 7mm) Internal Diameter; M42x0. 6, there will be field curvature since the only optics would be the doublet objective lens. This is what I have on an APS-C sensor. Consequently the same field flattener should work quite well on scopes with similar focal lengths. With a cropped sensor on a DSLR, stars were pin-sharp from edge to edge. I own an Orion ED80 F/7. The newly designed 645 flattener features two fully multi-coated lens elements in two groups and provides outstanding correction out to a 60 mm image circle. The flattener was reviewed in the September 2009 issue of Sky & Telescope, page 38. Full frame size. Customer reviews Nov 14, 2020 · ZWO ASI183MC on Sky-Watcher Evoguide50ED with the Sky-Watcher Evoguide 50ED Field Flattener. 75 female thread Extension factor: 1. 00 Add to cart; 7922 – M49. Explore Scientific’s 2” field Mar 6, 2019 · Flattener for AT80EDT? - posted in Refractors : After having an 8 inch SCT for a long time I just received my first refractor. Considering the high price, is there any other scope I should be Jan 5, 2008 · How do field flatteners work? - posted in Refractors : I recently bought a field flattener for a Takahashi FS-78. Designed with nearly Full frame chip-size DSLR cameras in mind Nov 12, 2011 · Field flattener/reducer for Megrez 110 - posted in Experienced Deep Sky Imaging: I am currently using a W. This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7. 8x Quadruplet Super Reducer for BORG 55FL 7215 - BORG 1. 08x Field Flattener 7880 - BORG 0. I remember the Borg Super Reducer on my Borg 150ED was designed for use with 6x9 medium format cameras and had an 88mm flat field making the scope F4. ThanksGary BEALNew Zealand Nov 21, 2017 · Page 1 of 15 - Borg 90FL - Ultimate optics in small form factor? - posted in Refractors : Ive been doing a lot of reading and a heck of a lot of talking, and I have decided I definitely want a maximum-aperture travel scope, that will absolutely be used at home and out at dark sites. I had a search around for a flattener/reducer, but the original Borg-made stuff is already out of production, apart from being super-expensive too! This TS FLAT2 Field Flattener is designed for APO/ED and Fraunhofer refractor telescopes with focal ratios of f/4 to f/9. Provides an evenly illuminated flat field. The flattener is installed between the telescope and the camera. 00. Apr 12, 2008 · Reducer Field Flattener For TMB/Lomo 80mm f6 - posted in Swap & Shop Archives: Looking for something to make imaging possible with this wonderful scope. Doesnt seem to work that well on the FS-78. It will also work well with telescope focal lengths narrowly outside this optimised f/range if using an astronomy camera with a smaller sensor. 5 to f/6. 9x reducer/flattener that reduces focal length to 360mm (f/5. 0. I would be very surprised if you got acceptable full frame images without the flattener at f5. 8 Extension Tube L $ 35. O. Apr 13, 2021 · A high-quality, non-focal-reducing Field Flattener optimised for DSLR imaging on refractor telescopes with focal ratios around f/5. I havent yet found basic info on how field flatteners are designed so I thought Id see if knowledgeable people here on CN could provide some basics. With my 27 mm Panoptic, my 10 mm, 7 mm, 5 mm and 3. 08x multi-flattener is adjustable and covers full format sensors. Company No. Which one? If it helps at all I bought a GSO 8 in RC. William Optics Flat6A III 0. It is also a question of the scopes diameter. My my father is letting me borrow his ED80, so I can get some wider FOV shots than with my C8. Full manufacturers warranty. 5 ratio refactors. 5 doublet but am considering buying a 55mm f3. I am curious if anyone has Ex Demo Askar Field Flattener for 185 APO Triplet. Feb 12, 2018 · Page 5 of 6 - Borg 90FL f4 astrograph versus Stellarvue SV80ST-25 triplet at f/4. the longer f/8. 00 Add to cart; 7790 – Drawtube DX $ 59. 5mm; 1. Astrophotographers can then enjoy images where the stars remain sharp right out to the edge of the exposure. I dont need a reducer particularly, just the flattener. The flattener, also called a field flattener, corrects this effect. 6 and, if you want, to add Borg 7108 field flattener. 8x ff/fr for my Megrez 110. The Astro-Tech AT80EDT. Mar 24, 2020 · Some general questions about field flatteners - posted in ATM, Optics and DIY Forum: As a short refractor owner (AT60ED f/6, Evoguide 50ED) and also a C11 owner, Ive been trying to learn more about field flatteners/correctors. 4X, or a visual field flattener? The Borg 1. The information shown below refers specifically to the Pentax 67 camera mount, but also Borg 1. 5 mm UWA 82° the Borg 107FL shows needle-sharp stars across the entire field of view (Yes, the stars are sharp from the center of the field to the field stop!). The specs look quite impressive, for the given focal length. 0x flattener for the Askar 185 APO Triplet telescope corrects field curvature and coma, resulting in flatter field edges and finer star points. Will also provide much improved results on refractors with focal lengths narrowly outside this optimised f/range. Borg 205mm length 80mm diameter tube 7803 is used to allow Borg 71FL f4 telescope to work at f5. 4x Teleconverter DX Dec 13, 2018 · Nevertheless, with my Borg 107FL, field curvature is a non issue for me. Focal length is adjustable for various refractors including non-BORG telescopes. ? The Astro-Tech 2? field flattener has been designed to optimize the flat-field imaging performance of Astro-Tech and TMB apochromatic refractors, even the very fast f/5. Works with objectives between 300 – 800mm focal length via adjustable lens barrel; Fully covers 35mm full format sensors; M57 male on objective side; M57 female on camera side Jan 6, 2017 · I purchased a Borg 71FL from Hutech back in 2013. So, I need to get a field flattener for it. Native at f/8 1624 focal Nov 11, 2019 · The field flattener does its job superbly. 5 the field is flattened across the entire sensor. But there are a few technical things to sort out when using a field flattener: 7108 – BORG 1. Jan 6, 2017 · Borg 71FL - converting from helical to FT 2-inch - posted in Refractors : I purchased a Borg 71FL from Hutech back in 2013. How To Use a Field Flattener. Sep 29, 2017 · In general field flatteners for full frame cameras or larger are $$$ and may require larger than 2" focusers. 6 with field flattener - posted in Refractors : Hi guys, I dont see much info on the forums for BORG refractors. With the reducer, the field of view is 45 arc minutes in diameter. Ex demo, open box. 8x Reducer / Field Flattener enables DSLR astrophotography with most f/5-f/7 refractor telescopes. I dont want too I decided to get this non-reducing flattener. 75 male thread. 1. First Light Optics Ltd Unit 7 Budlake Units Budlake Road Marsh Barton Trading Estate Exeter, Devon EX2 8PY. 00 Jul 15, 2024 · Founder Universal Field Flattener. 00 William Optics Flat61 1. Covers full frame camera field of view. Great scopes but Mar 11, 2020 · This useful non-reducing Field Flattener enables DSLR astrophotography with most f/5-f/7 refractor telescopes. I will be using this scope mainly for imaging with a full frame DSLR. 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 Sep 22, 2020 · NEW SkyWatcher Field Flattener for Evoguide 50 ED. Der # 7108 Korrektor ist für alle Refraktoren von 300 mm bis 800 mm Brennweite einsetzbar. 5mm filter thread in… Borg 1. May 4, 2022 · This field flattener gives a definite improvement in definition towards the edges of the frame on a Micro 4/3 camera. Field flattener lenses counteract the Petzval field curvature of an optical system, mitigating the field-angle dependence of the focal length of a system. 00 William Optics Flat61R Reducer Flattener with Rotator HK$2,280. 00 Add to cart; 7880 - BORG 0. Ive tried many different distances from my SXV-H9 chip to the reducer and still get weird stars no matter what. In this equation, FL is divided by 3 because the radius of curvature of the refractor is focal length / 3. Quick View William Optics Adjustable Flattener 6A III for FLT91 The system is set up for visual observation as well as astrophotography. Mar 10, 2021 · This useful 0. The 1. A must-have for imaging! Jul 31, 2022 · Best Field Flattener for Evostar 72ED? - posted in Beginning Deep Sky Imaging: Im trying to add a field flattener to my Evostar 72 ED. I noticed searching the web Borg has a flattener that works on scopes from FS-78 up to 100mm plus. It does this without changing the telescope's focal ratio, which remains f/7. The images looked great, except for some epic field curvature. Astro-Tech does sell a dedicated reducer/flattener for this scope, the ATREDT8. 08x multi flattener, fully covering full frame sensor. Reasoning behind these changes: - the newer reducer/field flattener is optimized for the 71FL and 90FL - I want to May 29, 2018 · I use this TS flattener for my Borg and for visual, I get a nice flat field. However different scope designs will have slightly different monochromatic/Seidel aberrations (coma, astigmatism, field curvature, spherical, distortion). 25" (31. Specifications. Field curvature should be roughly proportional to focal length. The ARCO rotator will not work with the Borg at present because there isn’t a suitable adaptor. I can add the 7108 Borg 1. 04X Multi-flattener, part number 7784, is designed for use as a photographic field flattener for 35mm photography with refractors between 450mm and 1200mm Jun 9, 2020 · By "visual extender" do you mean a multiplier like the Borg 1. Ive found three options: The manufacturer recommends the Sky-Watcher 0. 4, lightweight and portable that comes also with 0. 7 Refractor, which I plant to use for imaging too. Thanks to SESTO SENSO 2 and PLUS rings that avoid any flexure, it's perfect for wide field astrophotography of deep-sky object! Feb 19, 2019 · Field flattener for ED80 - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: Hello friends, and thanks in advance. 5 to f6. 4X multipliers adjust for different focal lengths, so maybe they could both multiply and flatten the field? But Borg only seems to talk about magnification --- you'd think if it also flattened the field or reduced aberrations they'd say so. It also had 4 elements one of which was ED and retailed for $1095. 6 apochromatic with field flattener for US$1199. But it is not in stock and it could be 60-90 days Sep 4, 2010 · TEC140 reducer-flattener? - posted in Equipment (No astrophotography): Hi, Im still trying to find a flattener reducer that will work with a TEC140. The StellaMira 110mm f6 covers most of the MFT format sharply, but the clearer detail over the outer parts makes the accessory worthwhile, as it only costs 10% of the price of the telescope. Type 2 . Possibles are the Televue 0. I decided to get this non-reducing flattener. A few questions: 1. The box says its for a Sky 90 but all the dealer sites say it will work on the FS-78 and FS-60. Jul 23, 2024 · The field curvature potentially visible in a doublet or triplet refractor is calculated using Field Curvature = (SQRT ((FL/3) 2 - (FS/2) 2)) - (FL/3), where FL is the focal length of the scope and FS is the eyepiece field stop diameter. It is in excellent (almost like new) condition. Coatings: Fully Multi-Coated; Mounting: M42 (T) and M48; Clear Aperture: 38mm Borg 1,08x Field Flattener für Refraktorteleskope. 8 - posted in Refractors : Steven, I look forward to reading on its performance as well as seeing photos taken. Just starting to get this RC I bought set up trying to collimate it but that is another issue. 5892293 This flattener provides a large image circle to accommodate larger imaging sensors and replaces the 67 flattener, which has now been discontinued. 1 FS128. New Adjustable Flat6Alll (T-mount not included) This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7. 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). I was just pointed to the BORG 107FL F3. This useful non-reducing Adjustable Field Flattener enables DSLR astrophotography with most f/5-f/7 refractor telescopes. 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. Il tubo Borg lunghezza 205mm diametro 80mm 7803 viene utilizzato per consentire al telescopio Borg 71FL f4 di funzionare a f5. It is also reported to work well with RC scopes and can be used with telescope focal lengths narrowly outside this optimised f/range if using an This curvature causes stars that are imaged at the edge of the field of view to be less sharp. May 3, 2022 · Tell me about your Borgs - posted in Refractors : When Im ready to upgrade from my current 80mm Astro-Tech refractor (which is marvelous), Im considering looking into a Borg telescope as I am attracted to their light weight and low focal lengths. I really love star-hopping with a huge field of view sometimes just stargazing through a telescope, really. Jan 9, 2023 · To get to f6 you then add the 1. I had a 71FL and 90FL in the past for visual. Two-Element Design; Fully Multi-Coated Optics; 28mm Imaging Circle; 6º Pinpoint Stars; Back Focus 17. 8x Quadruplet Super Reducer for BORG 55FL Dec 23, 2020 · Field Flattener/Focal Reducer for Borg 89ED - posted in Refractors : Hi there, I recently got a BORG 89ED APO F6. 72x reducer and replace the helical focuser with the FeatherTouch 2-inch (FTF) offered by Hutech. The question is simple. 8) and manual rotator. The scope itself has a few tiny nicks in the paint job (see pics) and the main tube has lost some of its shine. The Borg 1. Corrects field curvature and off-axis astigmatism in F5 to F7 Refractors. WO Flat6A lll will provide good illumination and flat field across 97% of full frame sized sensors. Dec 22, 2016 · RC field flattener - posted in Beginning Deep Sky Imaging: Hoping for a little help. Centre is stunning, but edges look like a seagull colony at flight. That’s it. 00 Add to cart; 7108 - BORG 1. Do refractors suffer the same aberration Nov 21, 2018 · Page 1 of 3 - BORG 107FL F3. Olly Jun 8, 2015 · An optically-matched M48-fitting doublet field flattener for Sky-Watcher's Esprit 80 ED PRO triplet refractor. When using a DSLR and a refractor between f/5. . The Starfield 1. However various sources Ive found seem This very elegant 2" reducer/field flattener has been designed to optimize the flat-field imaging performance of William Optics F/6 to F7. This Borg 1. 75 Exterior Thread (T2) Green Anodised Aluminium Screw-on End Caps; Net Weight 7108 – BORG 1. 00 Add to cart; 7026 – Series 80 tube – 25mm long $ 45. 0x Adjustable Flattener HK$1,780. 08x Working distance to camera: 55 mm Illumination and correction up to full Borg Multi-Flattener [8670] The Borg Multi-flattener, part number 8670 is designed for use as a photographic field flattener for Borg 100, 125 and 150mm refractors when used with medium format cameras such as the Pentax 67 line or Mitsuboshi astro cameras. Would it be a good addition given my Orion 80 or overkill? 2. 6 e, se si vuole, di aggiungere lo spianatore Borg 7108. Ill consider anything and everything. I currently have an AT72EDII which is an excellent little scope for quick views and carefree use due to its New Back Focus Adjustable Field Flattener dedicated for William Optics Zenithstar 73. Features. 9ED scope, which appears to be a new design from Borg. 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. So I'm wondering about the degree of color correction in the Borg vs. 08x flattener. This field flattener fully UPDATE: we're closed for summer holidays, shipments will resume on August 21st. This Universal Field Flattener from Founder is perfect for the Founder FOT86 and other Refractors with focal ratios between F5 and F7. This field flattener fully covers Full Frame (24x36mm) sensors and it comes M57 male thread on telescope side and M57 female thread on camera side. 85x Focal Reducer & Corrector for EvoStar 80ED which requires an additional adapter. 9ED - posted in Refractors : I have been in the market for some new scopes for a while. The moasic is scaled down to half size to meet the upload size. In addition to reducing the Mewlon focal length and focal ratio, this reducer also acts as a field flattener and corrector to reduce the coma inherent in the Dall-Kirkham design as well as the curvature of field that put stars at the edge of the field subtly out of focus. eultcuexdokkymcqkmgbgvaejbtdsywaxltyboqzynglmaymfrnxbyyr