antares vs celestron focal reducer

Free shipping $189.95 I use it on my C8 SCT with a 1000d, and it seems to do everything written on the tin. Try & buy if you like - usual mates rates. I've only used it a few times but it looks good to me. A longer effective focal length leads to higher magnification with a given eyepiece for visual observers. 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 . Focal Reducer, 2", 0.7X. If used before or beyond the working distance, unwanted image distortion may result, especially when using cameras with larger sensors. Given past experience with them, I decided not to include the Meade version in my little experiment, as I have never met one I liked from getting one of the too-short focal length models, to one with some overflow cement in the doublet, to focus difficulties with some eyepieces. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. If you want to use them for visual - try maybe long focal length eyepieces rather than the reducer. No retailers currently carry this product. No idea what the issue is. Scope size might influence choice as well, as a C6 might benefit from the Antares' transparency, while larger scopes might benefit from the Celestron's higher contrast. 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. This is the distance at which the reducer must be placed in front of the eyepiece or camera focal plane in order to operate at the design reduction factor. By ), 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. For example, an 8" SCT without a focal reducer has an illuminated field of 38mm at 50% fall-off. DUE TO EXTREMELY HIGH DEMAND, WE WILL NOT BE TAKING NEW ORDERS UNTIL MONDAY, DECEMBER 14. 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. Celestron Focus Motor for SCT, EdgeHD & 8" RASA, Celestron C6 0.63 reducer/flattener back focus. The most significant mechanical variation, however, is the quality and precision of the threading. 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). As a Barlow's magnification increases with increasing distance from the Barlow, a focal reducer's reduction increases with increasing distance from the reducer. Hi. Our proprietary StarBright XLT optical coatings dramatically increase transmission, up to 97.4% on our Schmidt corrector lenses. Nebula Filters. Explore Scientific Keys to the Universe Sale, Antares f/6.3 Focal Reducer for Schmidt-Cassegrain Telescopes, Skip to the beginning of the images gallery. With this telescope and this focal reducer, it does not help to move to a 2" eyepiece and a 2" diagonal as the visual view will be akin to looking through a porthole within the larger apparent field of view of the eyepiece. Reducer Lens .7x - EdgeHD 800 Learn More. Have a promo code? The reduction factor MR can also be written in terms of d2 as: When the focal reducer is placed at the working distance, D, that is when d2=D, then the reduction factor MR is equal to the design reduction factor MRD: Equations (6) and (7) imply these important considerations: Most manufacturers do not publish the focal length of their focal reducers, so it is not usually possible to calculate the working distance and design reduction factor. 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. Have always disliked the crude, noisy SCT threads, but I get it. But in the Japan version I have never noticed any anomaly like the ghosting in the China R/C. In terms of reduction and correction - which are what reducer/correctors are supposed to do - both are superb. WiFi technology encircles the globe in a web of connectivity, knowledge, and information. The focal length of a focal reducer is usually measured from the rear lens surface of the reducer (and not the reducer's housing). No negative issues to report. Can you help me? 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. It can also be used with any other small chip CCD camera having a 1.25" nosepiece, such as the Celestron NexImage, Meade DSI . They only publish the value of D, the working distance (sometimes called the back focus distance) and the design reduction factor MRD. Some faster refractors with a focal ratio of f/6, for example, only require field flatteners and not focal reducers. 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. To further factor out my natural astigmatism (I normally wear glasses while observing), I did the tests with my regular progressive lenses, single vision glasses I use when observing, and naked eye. Celestron or Antares f/6.3 focal reducer for SCT? Scope size might influence choice as well, as a C6 might benefit from the Antares' transparency, while larger scopes might benefit from the Celestron's higher contrast. This "speeds up" the optical train by reducing the focal length and magnification of the scope, requiring less time to integrate the same signal. The distance d2, which measures the position of the new focal plane of the objective from the back of the focal reducer is given by Equation 5: In these equations, d1, d2, and MR are all variables that depend on each other through Equations 2 and 4. Read our guide! . GSO, for example, has a 0.75x reducer for RC scopes with a back focus of 80mm, which is usually enough room for a wide range of astronomy cameras and accessories and spacers as needed. Download the Celestron PWI Telescope Control Software. It's important to match the back focus to within a millimeter or two to get an optimal image, especially with cameras with larger sensors. Despite never removing it no matter what I was looking at. Figure 1 shows the relationship between the focal reduction factor MR and the position of the reducer in the optical path. You need to be a member in order to leave a comment. If you do so, you will achieve the design reduction factor. Does anyone know if the Antares 4000 focal reducer is as good as the Celestron focal reducer. This is a. Figure 2 shows the effective of a focal reducer on the light from a telescope objective. 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. However, this also came at a cost, as the sky background in the Antares was slightly brighter. CPWI has an extensive object database, employs PointXP mount modeling, and more. Several functions may not work. I've never found my 0.63 reducer causing CA when used with my SCT. They usually have a 2" barrel that slides into the telescope focuser. This should not be the case if they have their purportedly different focal lengths. Because I have not heard any complaints about the made in China R/C. It features a standard male SCT thread (2" OD, 24 TPI) on one side and a standard SCT female thread on the other. Such an image circle is still large enough to encompass the relatively large sensor of many deep-sky astronomy cameras. The faster f/ratio allows you to use slower film or shoot in lower light level situations and still properly expose your subject. Perfect for the serious student, professional scientist and discriminating hobbyist. Go behind the scenes with Celestrons product development team and learn more about our award-winning and patented innovations. There will be no shipments on 3/1/2023, 3/2/2023, or 3/3/2023 (March 1st - March 3rd, 2023). As a consequence, the standard f/6.3 and f/3.3 focal reducers for SCT scopes do not work. We only send interesting emails and will never sell your data. Brightness, color, and contrast were subtly different, but could be as much the day they were coated as any real difference in the two brands. Many Ritchey-Chretien telescopes available today are made by GSO. Sign up for a new account in our community. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. Meade and Celestron both sell such SCT-T adapters with the correct optical length. A former wireless communications consulting engineer and management consultant to various Fortune 500 companies, Manish started Agena AstroProducts in 2003. Take control of your telescope! The Celestron f/6.3 is ~150 compared to the Antares at ~70. Not noticed any optical problems. ED glass is specially formulated and contains rare-earth compounds that greatly reduce a visual defect called chromatic aberration. This part is no longer in production, but it is sometimes available used and may be used with cameras with smaller sensors. Another factor to consider: focal reducers also increase the angle at which light approaches the focal plane. InternetSales@optcorp.com, 800-483-6287 Sharpness is essentially the same. 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. a Tele Vue Panoptic), or a Plossl eyepiece with an apparent field of view of 50 and a focal length of 32mm. Since 2008, Brian has taught astronomy to tens of thousands of stargazers through his websites OneMinuteAstronomer.com and CosmicPursuits.com. Stars had a tiny bit more sparkle and pop. These RC reducers cannot be used with other types of telescopes. 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. Celestron Solar Safe filter technology is GUARANTEED SAFE for direct solar observation and has been independently tested by SAI Global Assurance Services. Details: The item must be the identical item, brand name, size, weight, color, quantity and model number. Focus misses by about 1 turnof the focus knob.Here is my solution:Buy a shorter 1.25 visual back for my scope. riklaunim Members 559 3,445 Location: Poland Posted October 11, 2010 They are reported as identical. Thanks. Completely stuck, completely frustrated. I have Hirsch focal reducer, which is yet another clone of the Celestron reducer. 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. 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. Focal reducers for refractors with focal ratio of f/7 to f/9, roughly, have a design reduction factor of about 0.75x to 0.8x and produce a flat field by correcting for the curvature of the objective lens. Copyright 2021 Stargazers Lounge The Reduction Factor and the Amount of Reduction are inversely related. I even lost track of which reducer I was using. Who cares? The telescope side of the barrel is often threaded with an M48 x 0.75 thread for standard 2" astronomy filters. 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. Community Forum Software by IP.BoardLicensed to: Cloudy Nights, E of San Francisco Bay and W of the Awahnee, This is not recommended for shared computers, reviews here that suggest a coating problem, Back to Celestron Computerized Telescopes, Looking for advice on first refractor and camera. For this test, I used a single configuration R/C, Click-lock, and 1.25 diagonal with the adapter. Get ready for a night of astroimaging with your mount faster than previously thought possible with All-Star Polar Alignment. Maybe I got a lemon. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. * Not a Retail Store * 16313 Arthur StreetCerritos, CA 90703, USA. Reducer - Corrector Rather than a direct side-by-side, I swapped the reducers so that I was using them on the exact same, well-collimated instrument. I'd favor the Japanese Celestron version over the others that are commercially available. We have placed cookies on your device to help make this website better. Explore Scientific Keys to the Universe Sale. We reserve the right to verify a competitor's advertised price and the availability of the item. The female end attaches to the rear cell of the telescope. Sign up for our newsletter to get exclusive deals, observing tips, and new product announcements. Celestron Reducer Lens .7x - EdgeHD 925 The EdgeHD .7x Focal Reducer Lens makes your EdgeHD 925 one full F-Stop faster than f/10, reducing your exposure time by half to capture the same brightness of object 5-element lens design Maintains similar. CEL-94245. control and Sky Viewer display makes selecting your target easy. All rights reserved. Unlike SCT telescopes, Ritchey-Chretien telescopes and Celestron Edge HD or Meade ACF scopes have internal optics that provide an inherently flat field, so these telescopes require a special focal reducer than does not provide additional correction for field curvature. Yellow and orange members of open clusters stood out a bit more as the various stars displayed their individuality. Not a bit. For Ritchey-Chretien telescopes such as those manufactured by GSO, there are also dedicated focal reducers with a reduction factor of 0.7x to 0.8x. There are many different types of focal reducers and they all effect. Each focal reducer has a fixed specification called the working distance or required back focus. Celestron is considered better in terms of QA, less likely to come with free dust, hair or fingerprint. Due to the design, the Reducer/Corrector lens does diminish a small amount of field curvature common to all Schmidt Cassegrain telescopes but does not eliminate it. 2. Check out our 2022 telescope buying guide here! 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. Sign up for OPT news, exclusive offers, and updates on the latest gear! The internal surfaces are blackened and glare-threaded to provide the highest contrast. 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. I'm going with the Celestron. These 0.63x focal reducers were originally designed to optimize for an image circle to match 36mm x 24mm film or its digital equivalent for astrophotography. Imagine having two telescopes in one a long focal length instrument for lunar and planetary work and a short focal length scope for deep sky observing and astrophotography. Equation 6 & 7 item two & three does not make sense, both say increase its reduction (one should say reduce its reduction?). Opticstar F6.3 Focal Reducer / Corrector. Easy solution found a very tiny dab of super lube on the threads and all was well and quiet. 1.2" in that scope is a field stop of 43mm at f/10 and 27mm at f/6.3. 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. But I am rusty, can you condense a bit for me please? I happily cycle through LRGB filters to build the image rather than do a whole run of one filter at a time.

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