Thks for that and its not for visual it for astrophotography. We will be glad to help. CPWI has an extensive object database, employs PointXP mount modeling, and more. With both, using the same diagonal set-up, the exact same stars were visible at the very edge of the FOV. The Antares f6.3 focal reducer screws directly to the visual-back thread of all popular SCTs and converts f10 instruments to f6.3. If used before or beyond the working distance, unwanted image distortion may result. I have this one Opticstar F6.3 Focal Reducer / Corrector. Over the course of a several nights of general observing, I swapped back and forth between the Antares and Celestron R/Cs on a wide variety of objects open clusters, brighter galaxies, a couple of nebulae, and globular clusters as well. As I understand it, compared to the old Meade SCT's, the ACF is already "coma corrected", so the standard Meade, Celestron etc F6.3 focal reducers are not suitable and will only worsen the images. 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. Because most modern Newtonians already have relatively fast focal ratios, these telescopes do not usually use focal reducers. InternetSales@optcorp.com, 800-483-6287 And when used in some refractors, the field flattening is not as accurate as it is in the f/10 SCTs. The two samples I have PERFORM IDENTICALLY. 0.63x Starizona Focal Reducer for SCTs- Awesome Astrophotography Fumbling around in the dark, fine threads might be a problem. As mentioned in Section 2.3, the reduction factor for these focal reducers can be varied by adding spacers to move the reducer further from the camera sensor or eyepiece. If you want to save a few buck watch the classifieds on CN. Please note, orders placed after 10am on 2/28/2023 will be delayed. SKU: CEL-94245. They only publish the value of D, the working distance (sometimes called the back focus distance) and the design reduction factor MRD. The brightness, shape, and distortion of specific stars in the exact same position at the edge of the field was precisely identical in both reducers. The internal surfaces are blackened and glare-threaded to provide the highest contrast. The Best Dedicated Astronomy Cameras for Beginners, Astronomik OIII 12nm CCD Filter - T-Threads, Pegasus Astro Dual Motor Focus Controller, 10 Micron 12kg (26.45lbs) Stainless Steel Counterweight- GM 2000, I would like more information regarding stock availability dates. Thanks Peter! Obviously bright objects like Jupiter or The Moon show the reflections. One focal reducer will not achieve optimum results with all types of telescopes, so there is no universal' focal reducer. Focal reducers for these relatively fast ED refractors are generally for imaging only, not for visual observation. Things change but when I rebought I got an Antares and it seems about the same to me. Is that distance D= Fo-d1=Fo-(d2/MR)? This is the simplest way to attach your ASI121 to your telescope. So, this past week I challenged the Antares and Celestron models to a head-to-hear on my C8 on some decent nights of good seeing and transparency in my Bortle 5-6 urban skies. Figure 6 shows a 1.25" focal reducer from GSO configured with a ZWO ASI224MC camera. I found both to be very good. This means that there must be sufficient travel on the telescope focuser to make up for this. Focal reducers for many SCTs and their flat-field equivalents usually have a back-focus distance of 105mm. The designed reduction factor (0.5x in the case of the GSO reducer example above) should be considered a rule of thumb or approximate value in most cases, rather than a very precise number. Blue Fireball M42 T/T2 Thread Camera Adapter for Prime Focus Photography - 2" # P-06, Celestron T-Ring for Canon EOS Camera # 93419, GSO 2" Crayford Focuser for SCTs - Dual Speed, Length of male SCT thread = 5mm (0.2") but this is preceded by an unthreaded part on the eyepiece side making the total length = 8.8mm (0.35"), Length of female SCT thread = 7.5mm (0.3"). 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. I only have the Celestron f/6.3. This factor is designated by a power that is less than 1, and it usually lies between 0.5x or 0.8x. ED glass is specially formulated and contains rare-earth compounds that greatly reduce a visual defect called chromatic aberration. For this test, I used a single configuration R/C, Click-lock, and 1.25 diagonal with the adapter. Each focal reducer has a fixed specification called the working distance or required back focus. Thanks for any advice or experience you could share. Sign up to receive sale alerts, news about upcoming celestial events, and telescope tips from our experts! Telescope Focal Reducers & Correctors - High Point Scientific Get ready for a night of astroimaging with your mount faster than previously thought possible with All-Star Polar Alignment. As mentioned in Section 2 of this guide, the reduction factor of a focal reducer depends on its position in the optical path relative to the eyepiece or camera. How about for visual observers? Will not focus with the stuff I have. From the SkyProdigy, a telescope so smart it can align itself, to our high-performance EdgeHD optical system, weve revolutionized the hobby of astronomy for beginners and advanced amateurs alike. Manish holds a Master's degree in Electrical Engineering from Virginia Tech and an MBA from the Kellogg School of Management at Northwestern University. I even lost track of which reducer I was using. Celestron Focus Motor for SCT, EdgeHD & 8" RASA, Celestron C6 0.63 reducer/flattener back focus. Like you, I am primarily visually observing but I have everything together now that so I am going to start experimenting with photography so we'll see how it does there. If you want to use them for visual - try maybe long focal length eyepieces rather than the reducer. I use it on my C8 SCT with a 1000d, and it seems to do everything written on the tin. which looks like the same one. Nowadays I tend to use the Celestron more with my refractors for imaging and viewing. Reducer Lens .7x - EdgeHD 1100 Learn More. Edited by bluewater, 05 September 2020 - 11:27 AM. This article explained the basics of how focal reducers work with various kinds of telescopes and how their working distance affects their reduction factor, and it provided sufficient detail to help amateur astronomer choose and use the right focal reducer for a particular application. It was used strictly for imaging, not visual observing. A reducer is a set of converging (or positive) lenses that cause the light from a telescope objective to converge at a steeper angle to the focal plane as if it were coming from an objective with a faster (lower) focal ratio and a shorter focal length. Better images are also obtained when using these focal reducers at a reduction factor of 0.5x 0.8x, approximately. Antares f/6.3 Focal Reducer for Schmidt-Cassegrain Telescopes - Agena Astro Any comments gratefully received. 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. Watch this before you buy Celestron 8SE SCT, or a Focal Reducer or a Hyperstar 7,758 views Mar 28, 2018 145 Dislike Share Ray's Astrophotography 42.3K subscribers Note: I am not paid or. No retailers currently carry this product. InternetSales@optcorp.com. However, the China 6.3 R/C has noticeable internal reflections that I haven't figured out yet. No negative issues to report. You attach the focal reducer to the rear port on a SCT and can keep it covered. However, it will not thread into William Optics accessories, and with GSO it is a hit or miss. Never noticed any anomalies with this unit. 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). Theres a long-running debate in these forums and even statements from some reputable dealers that the Antares is just a reducer (even though it is labeled Reducer/Corrector), whereas the Celestron is a true R/C, which flattens the SCTs naturally curved field and provides some edge correction. F 6.3 focal reducer/corrector. - Discussions - Stargazers Lounge This is a. It seems right to put some distance between the camera and the focal reducer, right? If the reducer is placed closer to the eyepiece or camera than the distance D, the reduction factor decreases. It is not a corrector or flattener. For the best experience on our site, be sure to turn on Javascript in your browser. A slight nod to the Antares for heft and higher transmission, but points to the Celestron for nice threads and better contrast. Also read the reviews here, including those at 4 stars. External Focusers for Schmidt-Cassegrain Telescopes 3.1 The Basics of SCT Threads Sign up for our newsletter to get exclusive deals, observing tips, and new product announcements. You currently have javascript disabled. Learn more about extra solar planets imagery, 3D Star rendering, observation planning, telescope control, multiple-panel printing, and much more. Thanks. For me the Antares was a little brighter and had the least scatter by a bit so the better coatings won. Some coma is visible in the corners, but the image is quite good for EAA applications. 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. JavaScript seems to be disabled in your browser. looks virtually identical, except for the lettering. Focal reducers also move the effective focal plane of the objective inward, that is, towards the objective (see Figure 1). The same illumination you have at the edge of a 27mm field, the C8 has at the edge of a 38mm field. Most refractor manufacturers such as William Optics, Tele Vue Optics, Explore Scientific, Sky-Watcher, William Optics, and Stellarvue make their own focal reducers optimized for use with their telescopes. CPWI has an extensive object database, employs PointXP mount modeling, and more. This would tell us exactly how well aberrations are corrected. One problem with getting opinions is that most of use do not have both reducers or have never done a side by side comparison. Equation (4) shows the relationship between the distance d2 and the reduction factor MR. We process your personal data as stated in our. Because of their distinct optical design, slower Schmidt-Cassegrain telescopes (SCT) with focal ratios of f/10 require a different design of focal reducer compared to refractors. The price for an item/offer must be listed and valid at the time of match. But the diameter of the image circle decreases by a factor of 0.63 to about 24mm. Again, these focal reducers are often provided by the telescope manufacturer. The nominal design reduction factor of these reducers is typically 0.5x. Celestrons aplanatic EdgeHD optics revolutionized astroimaging. Can you tell me about the use of reducers in Maksutov-Cassegrain telescopes? I was going to measure the difference in grams, but my lovely wife caught me trying to use her precious, high-tech kitchen scale for the cause, and put the kibosh on it. Orders placed after 12:00 PM Pacific Time will be shipped the next business day. The lens is housed in machined aluminum for are machined aluminum black anodized. Theoretically each of these combinations all varied-length light paths should have resulted in slightly different reductions between the Celestron and Antares, since they supposedly have different focal lengths. Some third-party vendors also make reducers for SCT scopes. Quite interestingly it bears the very same engravings of the Meade 4000 r/c (including "series 4000") except for "MEADE". As a consequence, the standard f/6.3 and f/3.3 focal reducers for SCT scopes do not work. But while the image gets brighter, the size of the image circle gets proportionately smaller. Free shipping $189.95 Just point the telescope at any three bright objectsstars, bright planets, or even the Moonand your telescope can orient itself with the night sky. If I had to go out on a very thick limb, I would have to say that these two reducers/correctors are, indeed, identical the exact same glass in slightly different housings with different lettering. I doubt there is any difference between the Antares and the Celestron except price. But when not in the box or on the telescope, there is no cover for the other end. 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. Reducer Lens .7x - EdgeHD 800 Learn More. Focal reducer for 8SE - Celestron vs. Antares - Cloudy Nights This is one of our best-selling items, and customers have reported that this product is at least as good as, and probably better than, other leading f/6.3 focal reducers sold on the market for a lot more. The focal length and design working distance for this focal reducer were not available from the manufacturer. In many cases, the answer is yes, especially for electronically-assisted astronomy (EAA). Most different was that the sky background was a little darker and more uniform, providing a tiny contrast boost for fainter objects. Completely stuck, completely frustrated. This appendix summarizes how this works based on simple equations from the book Telescope Optics by Rutten and van Venrooij. They are reported as identical. Again, to my surprise, there was absolutely no difference between the Celestron and Antares on any star. Optically, it consists of a four-element lens that is fully multi-coated for high contrast and resolution. It was also a little brighter in the center of the field with subtle darkening in the outer 20% or so. The EdgeHD .7x Focal Reducer Lens makes your EdgeHD 1100 one full F-Stop faster than f/10, reducing your exposure time by half to capture the same brightness of object . For example, a 0.8x reducer placed at the working distance provides a reduction of (1 0.8) x 100 = 20%. I really don't see any difference in the current crop except the "Meade" is usually the cheapest. Stars in the corner of the image frame are indistinguishable between the Antares and the Celestron. Many focal reducers for refractors have a working distance (or back focus distance) of 55mm. OPT Product Number: AE-SCTFR specifications Warranty 2 Year Warranty Works as advertised! It has only one cover, which surprised me. I was referring to the C6 to answer you specifically. But I am rusty, can you condense a bit for me please? The most significant mechanical variation, however, is the quality and precision of the threading. * Not a Retail Store * 16313 Arthur StreetCerritos, CA 90703, USA, Availability: Item has been discontinued by Agena and we no longer carry this item. Many Ritchey-Chretien telescopes available today are made by GSO. Since then, Agena has become one of the leading online retailers of telescopes and astronomical accessories worldwide. I've looked through one from Meade and first impression was that it was like the Celestron version. Weasner's Meade and Antares Focal Reducers Review The faster f/ratio allows you to use slower film or shoot in lower light level situations and still properly expose your subject. I have an 8SE, and am thinking about getting a focal reducer. Product Details. Celestron & Antares f/6.3 Reducer/Corrector Shoot-out Since the focal length of the reducer, FR, is fixed, as d2 increases then MR decreases. With spring galaxy season here, I decided to pick up a couple more to compare in a head-to-head shoot out. 0.5X focal reducer for Celestron, Meade, and Orion CCD imaging cameras For this shoot-out, I used a standard Celestron C8 with Starbright coatings. This article explains the basics of how focal reducers work with an astronomy telescope. Upgrading the Focuser of Your Schmidt-Cassegrain Telescope - Agena Astro Can these economical focal reducers from GSO and other vendors result in good images? Meade and Celestron both sell such SCT-T adapters with the correct optical length. It must be in stock at the time of Price Match for us to make a guarantee. In this case, d2 = FR/2, which means the back of the focal reducer is located at a distance FR/2 from the camera or eyepiece. So ab6110 is asking for a FR only without coma correction, there are a couple of brands who make special reducers for the ACF. Opticstar F6.3 Focal Reducer / Corrector. Please re-enable javascript to access full functionality. Yet, the Antares still easily and fully threaded without any hitches. Most reducers have a design reduction factor, MRD, that assumes the reducer is placed at a specific working distance, D, from the back surface of the focal reducer itself. Our proprietary StarBright XLT optical coatings dramatically increase transmission, up to 97.4% on our Schmidt corrector lenses. Celestron or Antares? Take control of your telescope! Here, there was a subtle difference . Maybe I got a lemon. 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. How to Set the Correct Back Focus for Your Telescope (Guide) 3. - thanks. This award-winning optical system reduces visual defects like field curvature and coma, creating an ultra-flat field for pinpoint stars all the way to the edge of todays largest imaging sensors. Just one question. It's easy! It might work but it does not tell us anything about how well or to what extent the product works to correct the field of an SCT. Reducer - Corrector I must admit, as well, that I no longer place a lot of stock in the notion that Chinese optics are inferior to Japanese or Taiwanese any longer, as manufacturing technology has really leveled the playing field today, with most Chinese optics being excellent. Field stop diameters are one of the specified specs of eyepieces. However, some focal reducers can be used on other models of telescopes, but this is not always possible. In these equations: The combined focal length of the objective and focal reducer is given by Equation 1: For example, when d1=0, that is, the focal reducer is at the focal plane of the objective, Fcomb=Fo, so the focal reducer has no effect. Great for home, classroom, or home-school use, this kit includes all the essential items youll need to begin exploring the wonders of the microscopic world. Nada. Reproduction without permission prohibited. Not one detectable iota of discernable difference. This rugged, 3-in-1 device features a true tactical 3-mode flashlight, a hand warmer, and a portable power bank for recharging your personal electronics on the go. With the Celestron Reducer/Corrector Lens, thats precisely what you get. For me, I was looking for, and planning to keep, the one that yielded the greatest reduction. If yes, what kind of focal reducers can I use? Celestrons patented StarSense Technology makes it easier than ever to locate objects in the night sky, even if youve never used a telescope before.
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