Melotte 15 - First Process in PixInsight (easy! However, even though the imprint on the item states "Reducer / Corrector" please note that his is a reducer only. 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. That includes, for example, a 1.25" eyepiece with an apparent field of view of 68 and a focal length of 24mm (eg. Celestron or Antares? For me, I was looking for, and planning to keep, the one that yielded the greatest reduction. In such cases, we will be happy to take the item back as per our standard return terms. Looking forward to the day when I can do a shoot-out between a Japan and China Celestron, just for kicks. My application is mostly visual now, but I'm looking to do more astrophotography over time. This factor is designated by a power that is less than 1, and it usually lies between 0.5x or 0.8x. The Celestron is both a corrector and focal reducer and the Antares is just a focal reducer. The naming convention of SCT focal reducers is a little confusing. 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. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. No rainchecks will be issued for items out of stock at OPTcorp.com to match a competitor's price. We will be glad to help. If used with other f/ratios, the field flattening characteristic may be unpredictable. It features a standard male SCT thread (2" OD, 24 TPI) on one side and a standard SCT female thread on the other. I've only used it a few times but it looks good to me. The Antares is supposed to be pretty comparable. Your wishlist has been temporarily saved. And, the reality is that every F/6.3 RC out there Celestron, Hirsch, Astromania, etc., etc. 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. As another example,GSO makes focal reducers for their line of Ritchey-Chretien imaging telescopes. Wow, that is a very detailed discussion! They both are great and I doubt my eyes could detect a difference in any one of them including the Japan version. Your price: $579.00. The same illumination you have at the edge of a 27mm field, the C8 has at the edge of a 38mm field. Figure 6 shows a 1.25" focal reducer from GSO configured with a ZWO ASI224MC camera. InternetSales@optcorp.com. control and Sky Viewer display makes selecting your target easy. 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. Dedicated focal reducers for refractors are intended primarily for imaging, not visual observation. But while the image gets brighter, the size of the image circle gets proportionately smaller. 800-483-6287 This is a. Even though they may have been slightly dimmer, galaxies were a bit easier to tease out of the urban light soup I deal with. I wont bother with differences in packaging, caps, etc. 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. Please let us know what topics you are interested in. No negative issues to report. 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. All Rights Reserved. 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. It can also be used with any other small chip CCD camera having a 1.25" nosepiece, such as the Celestron NexImage, Meade DSI . Performance wise what differences might there be using the reducer on a smaller scope. The working distance or required back focus, explained above, is usually specified and is far more important in practice. No retailers currently carry this product. Equation 6 & 7 item two & three does not make sense, both say increase its reduction (one should say reduce its reduction?). Does anyone have any experience with the Celestron and Antares focal reducers? Never used one, but read the reviews here that suggest a coating problem. Orders placed after 12:00 PM Pacific Time will be shipped the next business day. 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 equations and argument in the Appendix of this article shows the relationship between the working distance and the reduction factor. I was referring to the C6 to answer you specifically. 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. Using these numbers in equation 4 in the Appendix, below, we can easily calculate that the focal length of this unit is approximately103mm (it will be 103mm plus the small amount by which the rear lens surface of the reducer is recessed beneath the reducer housing). Manish holds a Master's degree in Electrical Engineering from Virginia Tech and an MBA from the Kellogg School of Management at Northwestern University. The amount of reduction is simply the percentage by which a reducer shortens the effective focal length of a telescope and is calculated as (1 Reduction Factor) x 100%. How to Set the Correct Back Focus for Your Telescope (Guide) We do not price match competitors if they are out of stock. 3. I have the Japanese version and although I haven't used it in quite awhile, the views through it were superb with no internal reflections at all. Another factor to consider: focal reducers also increase the angle at which light approaches the focal plane. A focal reducer does just the opposite of a Barlow lens or focal extender. If the reducer is placed elsewhere, at a position called the operating distance, the focal reduction factor will not be as advertised. No results, please adjust your filters. Several functions may not work. A former wireless communications consulting engineer and management consultant to various Fortune 500 companies, Manish started Agena AstroProducts in 2003. Hello! For example, an 8" SCT without a focal reducer has an illuminated field of 38mm at 50% fall-off. 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. We have tested our current batch and it works with Meade, Celestron, and Baader SCT accessories. I think I remember hearing the reduction factor is slightly different, cant remember more or less reduction. Still not sure what is the right gear for you? This superb fully multi-coated multi-element focal reducer takes advantage of the latest computer aided design techniques to achieve the highest standards of performance set by the brand leaders at a fraction of the cost. 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. In some cases, focal reducers also act as field flatteners by correcting for field curvature and coma of the objective lens. The price for an item/offer must be listed and valid at the time of match. With the barrel 1.25 reducer won't focus, all I get is fuzzy snowballs. Please re-enable javascript to access full functionality. . I happily cycle through LRGB filters to build the image rather than do a whole run of one filter at a time. So ab6110 is asking for a FR only without coma correction, there are a couple of brands who make special reducers for the ACF. These reducers can also be used for visual observing with SCT scopes with eyepieces with a field stop as large as 24-27mm. Sign up for a new account in our community. 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. 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. I own both and concur heartily. No idea what the issue is. What is likely is that fatigue sets in, and also that as the targets move toward or a way from the meridian there will be changes for that reason alone. Designed distancing using the reducer with a 1.25 visual back and 1.25 Televue mirror diagonal; In this case, an additional T-adapter (with an optical length of 50mm) is needed to get the spacing correct for a DSLR or other camera with a 55mm back focus. Celestron or Antares f/6.3 focal reducer for SCT? Antares f/6.3 Focal Reducer for Schmidt-Cassegrain Telescopes - Agena Astro Best evidence would by obtained by using a camera and evaluating the image both by eye and with a computer analysis. All additional accessories mount onto the exterior/male threads. Edited by bluewater, 05 September 2020 - 11:27 AM. 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. 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. 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. We will match any online price that we confirm as valid. ), but stars seemed a bit tighter and their colors were richer and more dramatic.

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