Reducer Lens .7x - EdgeHD 925 Learn More. Stars had a tiny bit more sparkle and pop. Celestron is considered better in terms of QA, less likely to come with free dust, hair or fingerprint. Quite interestingly it bears the very same engravings of the Meade 4000 r/c (including "series 4000") except for "MEADE". However, in principle, the reduction factor of a focal reducer can be varied by changing the distance from the back of the focal reducer to the camera or eyepiece. Thanks for pointing this out. Sign up for our newsletter to get exclusive deals, observing tips, and new product announcements. I don't know. 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. Will not focus with the stuff I have. One focal reducer will not achieve optimum results with all types of telescopes, so there is no universal' focal reducer. Celestron Solar Safe filter technology is GUARANTEED SAFE for direct solar observation and has been independently tested by SAI Global Assurance Services. A focal reducer does just the opposite of a Barlow lens or focal extender. 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. 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). 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. This focal reducer from Celestron reduces the effective focal length by 0.63X Enjoy the wider field of view & faster exposure times at f/6.3 with f/10 telescopes f/11 telescopes, such as the C14 will perform at f/7 The Celestron f/6.3 Reducer has four fully-multicoated elements Reduce your exposure times by a factor of 3! Several functions may not work. * Not a Retail Store * 16313 Arthur StreetCerritos, CA 90703, USA, Availability: Item has been discontinued by Agena and we no longer carry this item. I wonder whether, for example, Antares focal reducer for SCT belongs to the latter category. I've heard and read all kinds of things about the Antares being only a reducer and not a corrector, etc. I only have the Celestron f/6.3. Michael 1 ronin Members 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. And when used in some refractors, the field flattening is not as accurate as it is in the f/10 SCTs. As another example,GSO makes focal reducers for their line of Ritchey-Chretien imaging telescopes. 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 have both the Antares and the Celestron reducers. 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. It is not a corrector or flattener. Antares Click Lock Visual Back - posted in Cats & Casses: Here is the situation:I bought a Celestron CPC 1100 for visual use.Want to put on the scope simulteanously a6.3 focal reducer, filter wheel, and aneyepiece turret. If you want to save a few buck watch the classifieds on CN. I focus using a moonlight electronic focuser and focusmax. The review is a subjective visual impression, which is interesting but not best evidence. Again, to my surprise, there was absolutely no difference between the Celestron and Antares on any star. In terms of reduction and correction - which are what reducer/correctors are supposed to do - both are superb. riklaunim Members 559 3,445 Location: Poland Posted October 11, 2010 They are reported as identical. So, if you have a filter that is 3mm thick, you need to add 1mm of spacing to your imaging train to retain the correct back focus. Start Chat 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. There may have been an almost imperceptible difference, but the Antares and Celestron were producing precisely the same reduction. The Antares f6.3 focal reducer screws directly to the visual-back thread of all popular SCTs and converts f10 instruments to f6.3. You also wont be unhappy spending the few extra bucks on the Celestron for the pretty orange lettering, particularly if you can pick one up used, as I did. How about for visual observers? But is there a difference in quality between the Antares and the Celestron or Meade focal reducers? 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. 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. However, some focal reducers can be used on other models of telescopes, but this is not always possible. It must be in stock at the time of Price Match for us to make a guarantee. Telescope Optics, Rutten and van Venrooij, Chapter 15, Willman-Bell (1988). https://www.celestron.com/products/reducer-corrector, //cdn.shopify.com/s/files/1/1935/4371/products/94175_reducer_corrector_01.jpg?v=1603736883, //cdn.shopify.com/s/files/1/1935/4371/products/94175_reducer_corrector_01_medium.jpg?v=1603736883, Popular Science by Celestron StarSense Explorer DX 5" Smartphone App-Enabled Schmidt Cassegrain Telescope, Advanced VX 8" Schmidt-Cassegrain Telescope, C9.25 Optical Tube Assembly (CGE Dovetail), Advanced VX 6" Schmidt-Cassegrain Telescope, Advanced VX 700 Maksutov Cassegrain Telescope, CGX-L Equatorial 925 Schmidt-Cassegrain Telescope, CPC 1100 GPS (XLT) Computerized Telescope, CGX-L Equatorial 1400 Schmidt-Cassegrain Telescope, CGX-L Equatorial 1100 Schmidt-Cassegrain Telescope, CGX Equatorial 925 Schmidt-Cassegrain Telescope, CGX Equatorial 800 Schmidt-Cassegrain Telescope, CGX Equatorial 1100 Schmidt-Cassegrain Telescope, CGEM II 1100 Schmidt-Cassegrain Telescope, Advanced VX 9.25" Schmidt-Cassegrain Telescope, Advanced VX 11" Schmidt-Cassegrain Telescope, Not compatible with #93648 Off-Axis Guider, not compatible with #93519 2" Mirror Diagonal (discontinued), Currently not compatible due to mechanical interferences. Details: The item must be the identical item, brand name, size, weight, color, quantity and model number. Manish Panjwani has been an active amateur astronomer since before Halley's Comet last flew by our neighborhood. The reducer fits all Meade and Celestron . Reducer - Corrector Things change but when I rebought I got an Antares and it seems about the same to me. Celestron Nexstar+ 127 SLT, several budget plossl eyepieces, Celestron 8-24mm zoom EP and a 12.5mm illuminated double reticle EP, Svbony SV205 camera w/.5 focal reducer, Celestron SkyMaster 20x80 binos on a 40 yr old QuickSet PanHead tripod, Stellarium, Sharpcap and ManyCam on my laptop, SkyView and Nightshift on my phone and a dandy little $9 . But the diameter of the image circle decreases by a factor of 0.63 to about 24mm. Specially-designed focal reducers are available for use with these telescopes. The Reducer/Corrector can also be used for terrestrial digiscoping. Most different was that the sky background was a little darker and more uniform, providing a tiny contrast boost for fainter objects. Each focal reducer has a fixed specification called the working distance or required back focus. Thanks for the extremely valuable article. The reducer is we might presume designed to correct to some as yet un-measured extent, the image of a standard SCT. The Celestron is both a corrector and focal reducer and the Antares is just a focal reducer. But I am rusty, can you condense a bit for me please? No retailers currently carry this product. This focal reducer is made to attach to the rear cell of Schmidt-Cassegrain or Maksutov-Cassegrain telescopes. Therefore, a 55mm back focus with a filter that is 3mm thick added to the imaging train would become 56mm. 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. The Buyer's Guide To Eyepieces at the top of the Eyepieces forum has a column for this spec. Well done. You can probably eke out 1.2 without noticing serious vignetting, which is a field stop of 31.5mm. For example, the focal reducer for an 8-inch Celestron EdgeHD telescope has a design reduction factor of 0.7x and a specified working distance (or back focus) of 105mm. M44 was a perfect target for this, as its large size maxes out the FOV on a C8 with a corrector, and its bright stars make great targets for measuring the very edge of the visible field. 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 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. If used with other f/ratios, the field flattening characteristic may be unpredictable. - thanks. because they really dont matter. Fortunately, my neighbors are not out in their backyards at 11 pm, or they may have thought I was torturing a small mammal. I've only used it a few times but it looks good to me. Your mileage may vary. However, this also came at a cost, as the sky background in the Antares was slightly brighter. However, because the field curvatures in refractors and SCTs vary a lot, I would predict unpredictable effects inre: field curvature. (Note: Using the simple equations above, the focal length of this reducer can be estimated to be about 350mm). High power views will provide flatter fields all the way to the edge, both visually and photographically. Sharpness is essentially the same. Bear in mind you can't squeeze blood out of a turnip, i.e. It's highly unlikely that they could be so precisely identical unless they were. For imagers, the main purpose of a focal reducer is to increase the brightness of the image at the focal plane. Based on Test 1 and Test 2, I think there is perhaps more validity to opposing statements here in these forums that the Antares and current China-made Celestron do, indeed, have exactly the same optics just with different housings and branding. Not one detectable iota of discernable difference. Also read the reviews here, including those at 4 stars. 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. Hi. 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. Does anyone have any experience with the Celestron and Antares focal reducers? 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 . Some third-party vendors also make reducers for SCT scopes. JavaScript seems to be disabled in your browser. Orders placed over the weekend will be shipped on the following Monday. The lens has a knurled surface, providing a tremendous gripping surface for threading/unthreading. You currently have javascript disabled. Thks for that and its not for visual it for astrophotography. If the reducer is placed elsewhere, at a position called the operating distance, the focal reduction factor will not be as advertised. Right off the bat, I was struck by how similar the two R/Cs were. Normal shipments will resume on Monday, March 6, 2023. nleash the full pointing accuracy of your Celestron computerized telescope with a specialized telescope control software suite.
