Many Ritchey-Chretien telescopes available today are made by GSO. You attach the focal reducer to the rear port on a SCT and can keep it covered. Manish holds a Master's degree in Electrical Engineering from Virginia Tech and an MBA from the Kellogg School of Management at Northwestern University. On the camera side, the focal reducer has male M42x0.75 or M48x0.75 threads that attach directly to the T-ring (with an M42-M48 adapter if necessary). This innovative software solves the time-consuming problem of trying to pinpoint the North Celestial Pole. Therefore, a 55mm back focus with a filter that is 3mm thick added to the imaging train would become 56mm. Celestron Focus Motor for SCT, EdgeHD & 8" RASA, Celestron C6 0.63 reducer/flattener back focus. I have the Antares and am not unhappy with it, but for AP I would want more back focal distance if those numbers are accurate. I happily cycle through LRGB filters to build the image rather than do a whole run of one filter at a time. As per the OP I still can't see any reason to buy the Celestron for significantly more $$$. Hello! I would not use the reducer with a 2" diagonal or eyepiece in the C6. Details: The item must be the identical item, brand name, size, weight, color, quantity and model number. More about this below. An image of about 24mm across, approximately, allows an observer to use a 1.25" eyepiece with a maximal field stop. Practical Considerations of Focal Reducers, 4.2 Back Focus Requirements of Focal Reducers, GSO makes focal reducers for their line of Ritchey-Chretien, Celestron makes a series of focal reducers for the Edge HD line, 0.75x focal reducers for these telescopes, focal reducer for an 8-inch Celestron EdgeHD, A Primer on T-Rings and T-Adapters for Astronomy and Astrophotography, Choosing the Best Telescope for Beginners 2023, Top Night Sky & Astronomy Events in August 2022, Top Night Sky & Astronomy Events in July 2022, Selecting a Baader Planetarium Star Diagonal, A Guide to Choosing Astronomy Eyepieces for Binoviewers, Choosing a Magnifying Finder Scope for Your Telescope, A focal reducer will provide its design reduction factor only when it is placed at the exact working distance from the focal plane of the eyepiece or camera, Reducing the operating distance, that is, moving a focal reducer closer to the eyepiece or camera increases its reduction factor, or conversely reduces the amount of focal reduction. They provide 0.75x focal reducers for these telescopes that takes an f/8 instrument down to f/6. This telescope control software replaces the hand control and allows the user to remotely control their Celestron computerized telescope from their personal PC or laptop. No idea what the issue is. I have Hirsch focal reducer, which is yet another clone of the Celestron reducer. This factor is designated by a power that is less than 1, and it usually lies between 0.5x or 0.8x. EclipSmart solar products feature Solar Safe filter technology providing the ultimate protection from harmful solar radiation, including both IR and UV light, and filters 99.999% of visible light. riklaunim Members 559 3,445 Location: Poland Posted October 11, 2010 They are reported as identical. Images in the Celestron tended to appear ever-so-slightly dimmer (maybe? if the illuminated field is 27mm wide without the reducer, it will be 27 x 0.63 = 17mm with it in place. Both exhibited consistent reduction, identical field flattening, and edge correction properties, and both were high quality optically and mechanically. With the barrel 1.25 reducer won't focus, all I get is fuzzy snowballs. When placed in the focal plane in front of a camera or eyepiece, a focal reducer leads to a wider field of view and a brighter image of extended objects, which is important for reducing the exposure times when imaging faint extended objects like nebulae or galaxies. Using an eyepiece with a 27mm field stop with the reducer will illuminate the edge the same as using an eyepieces with a 42.9mm field stop without it. This focal reducer from Celestron reduces the effective focal length by 0.63X Enjoy the wider field of view & faster exposure times at f/6.3 with f/10 telescopes f/11 telescopes, such as the C14 will perform at f/7 The Celestron f/6.3 Reducer has four fully-multicoated elements Reduce your exposure times by a factor of 3! 2023 Celestron, LLC. Yellow and orange members of open clusters stood out a bit more as the various stars displayed their individuality. Is there likely to be any differences in performance between using these on an 8 or something smaller like my 6SE? JavaScript seems to be disabled in your browser. Housings, threads, reduction, correction, blah, blah, blah. If you are using a camera that has a back focus of less than 55mm, additional spacer rings will be required between the reducer and the camera. The faster f/ratio allows you to use slower film or shoot in lower light level situations and still properly expose your subject. InternetSales@optcorp.com. Like many of us with SCTs, I have bought and sold a number of f/6.3 reducer/correctors over the years, and I have always been curious how they really stack up to each other.
0.5X focal reducer for Celestron, Meade, and Orion CCD imaging cameras The author finds differences in throughput and color balance, but then says he thinks the lenses are identical and he reaches his conclusions based on very long observing session. Or, when the distance of the focal reducer to the focal plane of the objective d1 equals the focal length of the focal reducer FR, the reduction factor MR = 0.5x. The lens has a knurled surface, providing a tremendous gripping surface for threading/unthreading. The distances d1 andd2 can also be expressed in terms of the focal length of the focal reducer FR with the lens equation: Using Equation 2, Equation 1 can also be expressed in terms of d2: The focal reduction factor of the focal reducer depends on its focal length and its distance from the focal plane of the objective as shown by Equation 4: Again, for example, when the focal reducer is placed at the original focal plane of the objective, d1=0 and MR=1, which means there is no focal reduction.
Product Details Antares' f/6.3 focal reducer provides a faster f/6.3 system for imaging or visual use when used with an f/10 SCT or other compatible telescopes. They both are great and I doubt my eyes could detect a difference in any one of them including the Japan version. And when d1 = FR, that is, when the focal reducer is placed at a distance from the focal plane of the objective that's equal to the reducer's focal length, the focal length of the combined optical system is Fo, so it acts as a 0.5x reducer. Turn it on and push Align. In about three minutes, youre ready to observe! 2.2 Using a Focal Reducer at the Working Distance, 2.3 Adjusting the Reduction Factor of a Focal Reducer, 3.3 Focal Reducers for Compound Telescopes, 3.5 Focal Reducers for Ritchey-Chretien and Field Flattened Scopes, 3.6 Focal Reducers in 1.25" and 2" Barrel Formats, 4. In terms of reduction and correction - which are what reducer/correctors are supposed to do - both are superb. However, manufacturers virtually never provide this specification. During checkout, you may also be shown other optional faster shipping choices.US Customers in Hawaii and Alaska: Free shipping applies to almost all products. If used with other f/ratios, the field flattening characteristic may be unpredictable. All Rights Reserved. More aggressive reduction, or using these reducers with larger sensors, will result in aberrations and distortions near the edge of the image. The Reduction Factor and the Amount of Reduction are inversely related. But when not in the box or on the telescope, there is no cover for the other end. In this configuration, the 29.5mm camera nosepiece and a 6mm extension ring positions the reducer at a working distance of 53.5mm from the camera sensor, which is located 12.5mm inside the front edge of the camera. Sky recognition technology that has revolutionized the manual telescope by eliminating the confusion common among beginners and enhancing the user experience for even seasoned telescope users. Keep in mind that these differences were very subtle, and could be due to normal variations in coatings among different runs, and not necessarily unique to the brands. Overall, this reducer does a phenomenal job at preventing gradients due to internal reflections from the camera sensor back to the glass in the reducer, as I suffered with the Antares reducer. I've heard and read all kinds of things about the Antares being only a reducer and not a corrector, etc. During a twenty-year scientific career, he developed laser systems to detect molecules found in interstellar space and planetary atmospheres, and leveraged his expertise to create laser technology for optical communications networks. Nowadays I tend to use the Celestron more with my refractors for imaging and viewing. . No difference.
Focal Reducer for SCT - ACF - Stargazers Lounge These RC reducers cannot be used with other types of telescopes. That said any comparison reviews are helpful. Unique focal reducer and field corrector lens accessory Reduces the focal length and f/ ratio of your Schmidt-Cassegrain telescope by 37% Provides a dual focal ratio instrument, without sacrificing image quality Compatible with all Schmidt-Cassegrain telescopes (see compatible list in description) Share Customers Also Purchased Description Still not sure what is the right gear for you? Easy solution found a very tiny dab of super lube on the threads and all was well and quiet. Celestrons aplanatic EdgeHD optics revolutionized astroimaging. The working distance or required back focus, explained above, is usually specified and is far more important in practice. Stars in the corner of the image frame are indistinguishable between the Antares and the Celestron. Edited by Tony Bonanno, 16 April 2021 - 06:44 PM. However, doesn't fit in the telescope and even if it did wouldn't work. Thanks Peter! If you want to use them for visual - try maybe long focal length eyepieces rather than the reducer. The visual back must be removed first. Based on Test 1 and Test 2, I think there is perhaps more validity to opposing statements here in these forums that the Antares and current China-made Celestron do, indeed, have exactly the same optics just with different housings and branding. 2. However, in principle, the reduction factor of a focal reducer can be varied by changing the distance from the back of the focal reducer to the camera or eyepiece. And when used in some refractors, the field flattening is not as accurate as it is in the f/10 SCTs. He received his first telescope at the age of 5 and completed his first university course in astronomy at the age of 12, eventually receiving a master's degree in the subject. Go behind the scenes with Celestrons product development team and learn more about our award-winning and patented innovations. Designed distancing using the reducer with a 1.25 visual back and 1.25 Televue mirror diagonal; This would tell us exactly how well aberrations are corrected. which looks like the same one. Melotte 15 - First Process in PixInsight (easy! The lens is housed in machined aluminum for are machined aluminum black anodized. Unscrew that wide angle lens and put it away, then attach the ASI120 to the nose-piece that came with the camera and fit that into the eyepiece holder. Such an image circle is still large enough to encompass the relatively large sensor of many deep-sky astronomy cameras. They are commonly available in 1.25" and 2" threaded cells that conveniently thread into the nosepiece of a compatible camera or the barrel of an eyepiece. 3. Focal reducers also move the effective focal plane of the objective inward, that is, towards the objective (see Figure 1). If the reducer is placed elsewhere, at a position called the operating distance, the focal reduction factor will not be as advertised. We do not price match competitors if they are out of stock. ), ASI Air Plus - Connected items are 'greyed out', Cost of ordering used equipment U.S. - Can can more than double figure, Tuthill Isostatic Mount and Star Trap Power Module. Assuming you use the reducer with the stock 1.25" diagonal, it will operate at f/6.3. Years ago, I bought the Antares version, and moved over to the Celestron. As often noted in reviews and forum threads, Antares products tend to have threads that are a little less precise, and this specimen certainly demonstrated this. We have corrected # (iii) after equations 6 & 7. Some manufacturers will specify the working distance from the middle of the rear lens surface, and this number must then be converted into a practical working distance number by subtracting the amount by which the rear lens surface is recessed in its housing. Rather than a direct side-by-side, I swapped the reducers so that I was using them on the exact same, well-collimated instrument. One of the most important factors in a telescope is its transmissionthe percentage of light that reaches the focal plane. Reducer Lens .7x - EdgeHD 800 This fully multi-coated lens provides maximum light transmission with near full-field illumination. We only send interesting emails and will never sell your data. They are reported as identical. The C8 has no noticeable vignetting with a 32mm Plssl in the f/6.3 reducer. Steve We reserve the right to verify a competitor's advertised price and the availability of the item. Add a 0.63x reducer, and the brightness of extended objects increases by (1/0.63)2 = 2.5. Most different was that the sky background was a little darker and more uniform, providing a tiny contrast boost for fainter objects. Focus misses by about 1 turnof the focus knob.Here is my solution:Buy a shorter 1.25 visual back for my scope. It's highly unlikely that they could be so precisely identical unless they were. This "speeds up" the optical train by reducing the focal length and magnification of the scope, requiring less time to integrate the same signal. One problem with getting opinions is that most of use do not have both reducers or have never done a side by side comparison. This filter threads on to the rear cell of your Celestron or Meade SCT telescope.
Telescope Focal Reducers & Correctors - High Point Scientific This focal reducer is made to attach to the rear cell of Schmidt-Cassegrain or Maksutov-Cassegrain telescopes. 800-483-6287 control and Sky Viewer display makes selecting your target easy. Meade once made an f/3.3 focal reducer for SCT scopes. It threads onto the rear cell of 5" to 16" Celestron and Meade Schmidt-Cassegrain telescopes, making it possible to have a dual focal ratio instrument without sacrificing image quality. An eyepiece with a 27mm field stop yields a true field of 1.03 in the C6 at f/10. We will match any online price that we confirm as valid. Learn more about extra solar planets imagery, 3D Star rendering, observation planning, telescope control, multiple-panel printing, and much more. This was most noticeable on the eyepiece end of the RC, where the metal rim surrounding the lens was about 1mm thicker than on the Celestron. Increasing the operating distance, that is, moving a focal reducer away from the eyepiece or camera reduces its reduction factor, or conversely increases the amount of reduction. Get ready for a night of astroimaging with your mount faster than previously thought possible with All-Star Polar Alignment. Opticstar F6.3 Focal Reducer / Corrector. The lens that the ZWO comes with give a perfect wide angle image of what is in front of it. Reducer Lens .7x - EdgeHD 1100 Learn More. For both imaging and visual observing, these reducers also improve image sharpness at the edge of the field by correcting for coma and field curvature. M44 was a perfect target for this, as its large size maxes out the FOV on a C8 with a corrector, and its bright stars make great targets for measuring the very edge of the visible field. Enter it during checkout! Generally, views through the Antares seemed a little more transparent and brighter. Please Log in to save it permanently. Brian Ventrudo is a writer, scientist, and astronomy educator. In practice, it's important to remember that you will rarely operate at the exact working distance and at the exact reduction factor that is specified. With the Celestron Reducer/Corrector Lens, thats precisely what you get. Despite never removing it no matter what I was looking at. For me, I was looking for, and planning to keep, the one that yielded the greatest reduction. https://www.celestron.com/products/reducer-corrector, //cdn.shopify.com/s/files/1/1935/4371/products/94175_reducer_corrector_01.jpg?v=1603736883, //cdn.shopify.com/s/files/1/1935/4371/products/94175_reducer_corrector_01_medium.jpg?v=1603736883, Popular Science by Celestron StarSense Explorer DX 5" Smartphone App-Enabled Schmidt Cassegrain Telescope, Advanced VX 8" Schmidt-Cassegrain Telescope, C9.25 Optical Tube Assembly (CGE Dovetail), Advanced VX 6" Schmidt-Cassegrain Telescope, Advanced VX 700 Maksutov Cassegrain Telescope, CGX-L Equatorial 925 Schmidt-Cassegrain Telescope, CPC 1100 GPS (XLT) Computerized Telescope, CGX-L Equatorial 1400 Schmidt-Cassegrain Telescope, CGX-L Equatorial 1100 Schmidt-Cassegrain Telescope, CGX Equatorial 925 Schmidt-Cassegrain Telescope, CGX Equatorial 800 Schmidt-Cassegrain Telescope, CGX Equatorial 1100 Schmidt-Cassegrain Telescope, CGEM II 1100 Schmidt-Cassegrain Telescope, Advanced VX 9.25" Schmidt-Cassegrain Telescope, Advanced VX 11" Schmidt-Cassegrain Telescope, Not compatible with #93648 Off-Axis Guider, not compatible with #93519 2" Mirror Diagonal (discontinued), Currently not compatible due to mechanical interferences. No experience with the Antares reducers, but I haven't personally seen a difference between Celestron and my current pair of made in Japan Meade reducers. Stock focusers in an SCT move the mirror of the scope to change the position of the focal plane, and they have sufficient travel to accommodate a focal reducer.
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