Generally, views through the Antares seemed a little more transparent and brighter. 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 working distance of the GSO 0.5x focal reducer with 1.25" barrel and the GSO 0.5x focal reducer with 2" barrel is about 51mm to 53mm, approximately, from the middle of the metal cell that holds the lens. Equation 6 & 7 item two & three does not make sense, both say increase its reduction (one should say reduce its reduction?). 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. Images in the Celestron tended to appear ever-so-slightly dimmer (maybe? The key points are as follows: So just remember that a smaller distance (from the camera or eyepiece) means a lower amount of reduction (and vice versa). Reducer Lens .7x - EdgeHD 800 Learn More. If a stronger level of focal reduction is used, say 0.5x, then the image circle may be too small to fill the sensor of larger cameras. Does anyone have any experience with the Celestron and Antares focal reducers? Not a bit. InternetSales@optcorp.com, 800-483-6287 Easy solution found a very tiny dab of super lube on the threads and all was well and quiet.. Thks for that and its not for visual it for astrophotography. Details: The item must be the identical item, brand name, size, weight, color, quantity and model number. That means the base of the mounting threads of the focal reducer needs to be 55mm from the camera sensor to achieve the design reduction factor, which is usually 0.8x or 0.85x. 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. I'm going with the Celestron. These scopes are compatibles with focal reducers. None of this was offensive, nor did it interfere with views in any significant way. Is that distance D= Fo-d1=Fo-(d2/MR)? 0.5X focal reducer for Celestron, Meade, and Orion CCD imaging cameras The Reducer/Corrector can also be used for terrestrial digiscoping. I have Hirsch focal reducer, which is yet another clone of the Celestron reducer. I had a Celestron, Antares and Hirsch for awhile and compared them over about a year. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. Download the Celestron PWI Telescope Control Software. 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. Thanks for pointing this out. Years ago, I bought the Antares version, and moved over to the Celestron. In most cases, the easiest option is to choose the focal reducer made specifically for your telescope. However, it will not thread into William Optics accessories, and with GSO it is a hit or miss. But when not in the box or on the telescope, there is no cover for the other end. For imagers, the main purpose of a focal reducer is to increase the brightness of the image at the focal plane. 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. The focal length of a focal reducer is usually measured from the rear lens surface of the reducer (and not the reducer's housing). Oceanside Photo & Telescope wants our customers to shop with confidence knowing that you will always get the best deal available. Our proprietary StarBright XLT optical coatings dramatically increase transmission, up to 97.4% on our Schmidt corrector lenses. My experience is that CN sellers are way above those listing elsewhere. Most manufacturers provide this specification. You attach the focal reducer to the rear port on a SCT and can keep it covered. Unlike . 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. It covers the basic optics and design specifications of a focal reducer, and goes through some practical factors to consider when selecting and using a focal reducer. The focal length and design working distance for this focal reducer were not available from the manufacturer. If used before or beyond the working distance, unwanted image distortion may result. 2023 OPT Telescopes. Here, there was a subtle difference . The female end attaches to the rear cell of the telescope. Reducer Lens .7x - EdgeHD 1100 - Celestron The same illumination you have at the edge of a 27mm field, the C8 has at the edge of a 38mm field. By I've seen some older threads saying that the Celestron, Meade and Antares FRs are all the same and manufactured in the same factory. * Not a Retail Store * 16313 Arthur StreetCerritos, CA 90703, USA. The more focal reduction, the further inward the focal plane will be. 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. But in the Japan version I have never noticed any anomaly like the ghosting in the China R/C. First, I wanted to compare the actual reduction provided by these competitors, as many threads here cite different ideal spacing from the reducer to eyepiece focal plane to achieve the correct f/6.3 result. The Celestron f/6.3 is ~150 compared to the Antares at ~70. 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. If I had to guess, the difference is maybe 10-15 grams. When the camera sensor is placed at this distance, the reduction factor of these reducers is 0.75x. In some cases, focal reducers also act as field flatteners by correcting for field curvature and coma of the objective lens. Celestron or Antares f/6.3 focal reducer for SCT? There are many different types of focal reducers and they all effect. A few people have reported issues with the male SCT thread diameter on this item being a bit larger than necessary. Yet, the Antares still easily and fully threaded without any hitches. A former wireless communications consulting engineer and management consultant to various Fortune 500 companies, Manish started Agena AstroProducts in 2003. The Reduction Factor and the Amount of Reduction are inversely related. Thanks. If you place your camera at a different working distance, you will get a different reduction factor and perhaps unwanted distortion in the image. Even though they may have been slightly dimmer, galaxies were a bit easier to tease out of the urban light soup I deal with. So it provides a 0.63x design reduction factor when used with an f/10 SCT at the specified working distance. 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. Regardless, the difference was miniscule and is more than adequate on both and exceeds a 8 or 6 SCTs baffle tube diameter. They both are great and I doubt my eyes could detect a difference in any one of them including the Japan version. WiFi technology encircles the globe in a web of connectivity, knowledge, and information. The Reducer/Corrector is easy to install by threading the unit onto the rear cell of your Schmidt-Cassegrain telescope (or the reducer plate of the C11 and C14). They only publish the value of D, the working distance (sometimes called the back focus distance) and the design reduction factor MRD. USD $80.00. I doubt there is any difference between the Antares and the Celestron except price. I've never found my 0.63 reducer causing CA when used with my SCT. The working distance (backfocus) of the Celestron f/6.3 reducer is specified to be 105mm from the base of the male SCT thread on the camera side. Meade once made an f/3.3 focal reducer for SCT scopes. This is a. Style: Again, swapping back and forth for a couple of hours on M44, M35, and several brighter stars, I examined the shape of specific stars near the edge of the field with both correctors. When you said, "in some cases" a focal reducer also works as a flattener/corrector, are you saying that not all focal reducers are flatteners/corrector? Photographically you also get a wider field and much shorter exposures. 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. I have/had both the Celestron (Japan) and Antares units. Explicitly designed for Celestron Schmidt-Cassegrain telescopes, this unique lens reduces your telescopes focal length and f/ ratio by 37%, turning your long focal length telescope into a fast, short focal length instrument. The faster f/ratio allows you to use slower film or shoot in lower light level situations and still properly expose your subject. Upgrading the Focuser of Your Schmidt-Cassegrain Telescope - Agena Astro Most different was that the sky background was a little darker and more uniform, providing a tiny contrast boost for fainter objects. There are also third-party vendors such as Hotech. I own both and concur heartily. If used before or beyond the working distance, unwanted image distortion may result, especially when using cameras with larger sensors. The working distance or required back focus, explained above, is usually specified and is far more important in practice. A focal reducer does just the opposite of a Barlow lens or focal extender. F6.3 Focal reducer for F/10 or higher telescopes, 43mm aperture, 4-Element, Fully Multicoated. We will match any online price that we confirm as valid. However I've also read that the back focal distance on the Celestron is 105mm while the Antares is 81mm so they couldn't be identical. Quite interestingly it bears the very same engravings of the Meade 4000 r/c (including "series 4000") except for "MEADE". I have had the Japan unit on the back of my C5 since 1994 or thereabouts. While most Barlow lenses and focal extenders work with most kinds of telescopes available to amateur astronomers, focal reducers are designed to work in a narrow range of focal ratios of a telescope objective. By using this site, you agree to our Terms of Use. No results, please adjust your filters. If you want to use them for visual - try maybe long focal length eyepieces rather than the reducer. All rights reserved. Since then, Agena has become one of the leading online retailers of telescopes and astronomical accessories worldwide. Given the results of Test #1, I wanted to see if there was any truth to this assumption.

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