No results, please adjust your filters. Quite interestingly it bears the very same engravings of the Meade 4000 r/c (including "series 4000") except for "MEADE". But in the Japan version I have never noticed any anomaly like the ghosting in the China R/C. 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. Bear in mind you can't squeeze blood out of a turnip, i.e. The Antares focal reducer comes in small box. 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. Clearly cost is a big factor for satisfied users. Turn it on and push Align. In about three minutes, youre ready to observe! You may need spacers or a T-adapter to ensure the correcting working distance. It's usually specified from the base of the mounting threads on the reducer's housing, and this is the most practical way of providing this specification. We only send interesting emails and will never sell your data. Easy solution found a very tiny dab of super lube on the threads and all was well and quiet.. This is a. Things change but when I rebought I got an Antares and it seems about the same to 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. Yet, the Antares still easily and fully threaded without any hitches. The easiest way to use a focal reducer is to make sure you place it at the specified working distance in front of your camera or eyepiece. Reducer Lens .7x - EdgeHD 925 This "speeds up" the optical train by reducing the focal length and magnification of the scope, requiring less time to integrate the same signal. They provide 0.75x focal reducers for these telescopes that takes an f/8 instrument down to f/6. control and Sky Viewer display makes selecting your target easy. The naming convention of SCT focal reducers is a little confusing. Focal reducer for 8SE - Celestron vs. Antares - Cloudy Nights But is there a difference in quality between the Antares and the Celestron or Meade focal reducers? Will not focus with the stuff I have. However, this also came at a cost, as the sky background in the Antares was slightly brighter. 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. Newtonian reflectors will seldom be able to accommodate the in-focus travel demanded by focal reducers. For example, a 0.8x reducer placed at the working distance provides a reduction of (1 0.8) x 100 = 20%. It also leads to larger (although fainter) images of extended objects like the Moon or planets for astrophotographers or visual observers. Meade does not make an equivalent line of focal reducers for the ACF scopes, although some models of Meade ACF are already at f/8, faster than the f/10 ratio of Celestron Edge HD scopes. 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. 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. I own both and concur heartily. The two samples I have PERFORM IDENTICALLY. 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. For the best experience on our site, be sure to turn on Javascript in your browser. 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. Many Ritchey-Chretien telescopes available today are made by GSO. Using one on such a scope would make demands on the eyepiece design and increase the exit pupil to an extent that focal reduction on fast Newts is not practical. 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. With spring galaxy season here, I decided to pick up a couple more to compare in a head-to-head shoot out. For imagers using longer focal-length refractors and SCTs, especially when using smaller sensors that place less demand on the focal reducer, there are economical alternatives for focal reducers from manufacturers such as GSO, Agena, and Antares. 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. Right off the bat, I was struck by how similar the two R/Cs were. Download the Celestron PWI Telescope Control Software. Upon close inspection, it was clear that the housing of Antares assembled in Canada version was a little more substantial than the Celestron. Wow, that is a very detailed discussion! Brian Ventrudo is a writer, scientist, and astronomy educator. What an enjoyable read and detailed comparison. Increase that distance, and greater reduction results and visa versa. More details are found in the Appendix of this article. My experience is that CN sellers are way above those listing elsewhere. Both exhibited consistent reduction, identical field flattening, and edge correction properties, and both were high quality optically and mechanically. One focal reducer will not achieve optimum results with all types of telescopes, so there is no universal' focal reducer. These reducers can also be used for visual observing with SCT scopes with eyepieces with a field stop as large as 24-27mm. October 11, 2010 in Discussions - Scopes / Whole setups. 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. - thanks. 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. Your wishlist has been temporarily saved. 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. 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%. This part is no longer in production, but it is sometimes available used and may be used with cameras with smaller sensors. Some third-party vendors also make reducers for SCT scopes. However, these will not impact optical performance. An f/6.3 reducer is designed to reduce the focal ratio of an f/10 SCT to f/6.3. F6.3 Focal reducer for F/10 or higher telescopes, 43mm aperture, 4-Element, Fully Multicoated. We have corrected # (iii) after equations 6 & 7. I've seen some older threads saying that the Celestron, Meade and Antares FRs are all the same and manufactured in the same factory. There are also third-party vendors such as Hotech. Explore Scientific - Keys to the Universe Sale. I had a Celestron, Antares and Hirsch for awhile and compared them over about a year. In some cases, focal reducers also act as field flatteners by correcting for field curvature and coma of the objective lens. 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 must be in stock at the time of Price Match for us to make a guarantee. JavaScript seems to be disabled in your browser. Since 2008, Brian has taught astronomy to tens of thousands of stargazers through his websites OneMinuteAstronomer.com and CosmicPursuits.com. I have Hirsch focal reducer, which is yet another clone of the Celestron reducer. The most significant mechanical variation, however, is the quality and precision of the threading. With the barrel 1.25 reducer won't focus, all I get is fuzzy snowballs. 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. Obviously bright objects like Jupiter or The Moon show the reflections. Optically, it consists of a four-element lens that is fully multi-coated for high contrast and resolution. This means that there must be sufficient travel on the telescope focuser to make up for this. That was fun. This focal reducer is made to attach to the rear cell of Schmidt-Cassegrain or Maksutov-Cassegrain telescopes. control and Sky Viewer display makes selecting your target easy. Regardless, the difference was miniscule and is more than adequate on both and exceeds a 8 or 6 SCTs baffle tube diameter. CPWI has an extensive object database, employs PointXP mount modeling, and more. 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. These reducers have a back focus (or design working distance) of 80mm. 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. The reducer fits all Meade and Celestron . Weasner's Meade and Antares Focal Reducers Review 3. This is very impressive performance given how hard this problem is to mitigate in general. Copyright 2003-2022 Agena AstroProducts. The same illumination you have at the edge of a 27mm field, the C8 has at the edge of a 38mm field. Field stop diameters are one of the specified specs of eyepieces. The lens is housed in machined aluminum for are machined aluminum black anodized. 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. . We process your personal data as stated in our. Reducer - Corrector This may be a problem if the focuser tube or the diagonal (for visual observing) is too narrow to accept light at this larger angle. On the trail, at the job site, in the classroom, or simply sitting at home relaxing the Celestron Elements ThermoTank 3 will keep your hands toasty. One problem with getting opinions is that most of use do not have both reducers or have never done a side by side comparison. Focal reducers are essential optical accessories for astrophotography, electronically-assisted astronomy (EAA), and in some cases, for visual observation with long focal ratio telescopes. Antares f/6.3 Focal Reducer for SCTs - Awesome Astro Getting the proper back-focus for your imaging camera is a vital step in getting the best data possible out of your telescope imaging/research rig. which looks like the same one. Manish Panjwani has been an active amateur astronomer since before Halley's Comet last flew by our neighborhood. The Celestron f/6.3 is ~150 compared to the Antares at ~70. 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. As a Barlow's magnification increases with increasing distance from the Barlow, a focal reducer's reduction increases with increasing distance from the reducer. Start Chat 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. Any comments gratefully received. But the smaller image circle means there is a limit to the field stop of an eyepiece that can achieve an unvignetted image. The stock Celestron visualback is just under 2 long. 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. Product Details. This innovative software solves the time-consuming problem of trying to pinpoint the North Celestial Pole. No rainchecks will be issued for items out of stock at OPTcorp.com to match a competitor's price. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. Antares f/6.3 SCT Focal Reducer - Rother Valley Optics Ltd Optically, it consists of a four-element lens that is fully multi-coated for high contrast and resolution. Thanks for the extremely valuable article. If I had to chose one, I would base my decision on your level of light pollution perhaps the Antares for its slightly higher transmission if you live under less light polluted skies, but the Celestron for its greater contrast if you are dealing with a suburban or urban light dome. A little longer light path with a 2 Baader click-lock, low profile 1.25 adapter, and the 1.25 diagonal; 2023 OPT Telescopes. All additional accessories mount onto the exterior/male threads. 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