This innovative software solves the time-consuming problem of trying to pinpoint the North Celestial Pole. The more focal reduction, the further inward the focal plane will be. That is definitely a 2" eyepiece, but it is not a large or long focal length 2" eyepiece. I wish there was. Easy solution found a very tiny dab of super lube on the threads and all was well and quiet. In every configuration, there were essentially parfocal, requiring only a tiny fine focus adjustment when changing correctors. A few large telescopes and mounts are excluded from this free shipping offer. I've only used it a few times but it looks good to me. This "speeds up" the optical train by reducing the focal length and magnification of the scope, requiring less time to integrate the same signal. However, the China 6.3 R/C has noticeable internal reflections that I haven't figured out yet. Celestron or Antares? Once focused it's pretty good. I was referring to the C6 to answer you specifically. This focal reducer is made to attach to the rear cell of Schmidt-Cassegrain or Maksutov-Cassegrain telescopes. However, some focal reducers can be used over a wider range of working distances, especially those with simpler optical design, and especially when used with cameras with smaller sensors. In some cases, focal reducers also act as field flatteners by correcting for field curvature and coma of the objective lens. Now, Celestron is using that same technology to allow star gazers to connect to the night sky and enhance their experience of the cosmos in fun and unique ways. Still not sure what is the right gear for you? No idea what the issue is. 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. Advanced designs for Schmidt-Cassegrain scopes such as the Meade ACF or Celestron Edge HD have optical elements in the tube to correct for coma and field flatness. An f/6.3 reducer is designed to reduce the focal ratio of an f/10 SCT to f/6.3. Increasing the operating distance, that is, moving a focal reducer away from the eyepiece or camera reduces its reduction factor, or conversely increases the amount of reduction. 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. To calculate how much back focus spacing you need to add, take the thickness of the filter and divide it by 3. (Note: Using the simple equations above, the focal length of this reducer can be estimated to be about 350mm). F6.3 Focal reducer for F/10 or higher telescopes, 43mm aperture, 4-Element, Fully Multicoated. 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. Thanks guys, I'm trying to get my ZWO ASI120MC-S to work with my 90mm Meade. Using an eyepiece with a 27mm field stop with the reducer will illuminate the edge the same as using an eyepieces with a 42.9mm field stop without it. 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. But in the Japan version I have never noticed any anomaly like the ghosting in the China R/C. . Reducer - Corrector I focus using a moonlight electronic focuser and focusmax. For this test, I used a single configuration R/C, Click-lock, and 1.25 diagonal with the adapter. More details are found in the Appendix of this article. Add a 0.63x reducer, and the brightness of extended objects increases by (1/0.63)2 = 2.5. Brian Ventrudo is a writer, scientist, and astronomy educator. I use it on my C8 SCT with a 1000d, and it seems to do everything written on the tin. The telescope side of the barrel is often threaded with an M48 x 0.75 thread for standard 2" astronomy filters. Each focal reducer has a fixed specification called the working distance or required back focus. Manish holds a Master's degree in Electrical Engineering from Virginia Tech and an MBA from the Kellogg School of Management at Northwestern University. Since the focal plane of an eyepiece is rarely precisely known(except for some brands such as Baader Planetarium and Tele Vue), and because the nosepiece of an eyepiece is of a fixed length, the actual reduction factor will be close to, but not exactly at, its designed reduction factor. 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. This Antares 1.25" 0.5x focal reducer lens (tele-compressor) is used under the Orion brand name to thread into the nosepiece of Orion StarShoot Solar System cameras and StarShoot Deep Space Color Imaging Camera. I don't know. For imaging, a T-adapter is threaded to the camera side of the focal reducer, which in turns connects to the camera with the appropriate hardware. For the best experience on our site, be sure to turn on Javascript in your browser. Therefore, a 55mm back focus with a filter that is 3mm thick added to the imaging train would become 56mm. But is there a difference in quality between the Antares and the Celestron or Meade focal reducers? For example, a 0.8x reducer placed at the working distance provides a reduction of (1 0.8) x 100 = 20%. However, this also came at a cost, as the sky background in the Antares was slightly brighter. For the best experience on our site, be sure to turn on Javascript in your browser. 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. Celestrons award-winning Nature DX binocular gets a major upgrade with the addition of ED objective lenses. The Antares FR2-0.7X is the same 4-element f/6.3 lens system used for f/10 Schmidt-Cassegrain telescopes but in a 2" barrel threaded for standard filters. 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. For both imaging and visual observing, these reducers also improve image sharpness at the edge of the field by correcting for coma and field curvature. Obviously bright objects like Jupiter or The Moon show the reflections. For the best experience on our site, be sure to turn on Javascript in your browser. 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. The equations in the Appendix show how this all works. You may need spacers or a T-adapter to ensure the correcting working distance. Melotte 15 - First Process in PixInsight (easy! There is one difference though the Antares came with only one lens cap whereas the Celestron had a cap for both ends. 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. 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. Steve If used with other f/ratios, the field flattening characteristic may be unpredictable. Contiguous US Customers:All items we sell ship for free within the Contiguous US. 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. Reducer Lens .7x - EdgeHD 1100 Learn More. The stock Celestron visualback is just under 2 long. For example, an 8" SCT without a focal reducer has an illuminated field of 38mm at 50% fall-off. Manish Panjwani has been an active amateur astronomer since before Halley's Comet last flew by our neighborhood. I use the same back spacing for both on a small 6" Celestron SCT. 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. 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) Share Customers Also Purchased Description Some coma is visible in the corners, but the image is quite good for EAA applications. The Celestron f/6.3 is ~150 compared to the Antares at ~70. This means that there must be sufficient travel on the telescope focuser to make up for this. The female end attaches to the rear cell of the telescope. Specially-designed focal reducers are available for use with these telescopes. Focus misses by about 1 turnof the focus knob.Here is my solution:Buy a shorter 1.25 visual back for my scope. There may have been an almost imperceptible difference, but the Antares and Celestron were producing precisely the same reduction. 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. Fastar Technology allows imagers the option of drastically increasing the speed and sensitivity of their Celestron optical tube, allowing bright, detailed images with short exposures. It works fine but you should stick with 1.25 EPs; or can use 2" EPs without corrector. Some refractors such the TeleVue Nagler-Petzval (NP), the Takahashi "FSQ", and the William Optics Redcat/WhiteCat 51 have inherently flat fields because of internal optical elements. Your wishlist has been temporarily saved. Celestron makes a series of focal reducers for the Edge HD line that are matched to the 8", 9.25", 11", and 14" apertures of these scopes. If it's positioned further from the eyepiece or camera and closer to the telescope objective, the reduction factor increases. Theres a long-running debate in these forums and even statements from some reputable dealers that the Antares is just a reducer (even though it is labeled Reducer/Corrector), whereas the Celestron is a true R/C, which flattens the SCTs naturally curved field and provides some edge correction. 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. Planetarium software package which provides easy-to-understand explanations and impressive visuals of all kinds. 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. Start here to find the perfect telescope for you! I wont bother with differences in packaging, caps, etc. And, the reality is that every F/6.3 RC out there Celestron, Hirsch, Astromania, etc., etc. Can you tell me about the use of reducers in Maksutov-Cassegrain telescopes? Yellow and orange members of open clusters stood out a bit more as the various stars displayed their individuality. Go behind the scenes with Celestrons product development team and learn more about our award-winning and patented innovations. The Antares focal reducer comes in small box. But when not in the box or on the telescope, there is no cover for the other end. Rather than a direct side-by-side, I swapped the reducers so that I was using them on the exact same, well-collimated instrument. Wow, that is a very detailed discussion! How about for visual observers? For this shoot-out, I used a standard Celestron C8 with Starbright coatings. Such an image circle is still large enough to encompass the relatively large sensor of many deep-sky astronomy cameras. Meade once made an f/3.3 focal reducer for SCT scopes. With the barrel 1.25 reducer won't focus, all I get is fuzzy snowballs. I own both and concur heartily. They are also less expensive than many external focusers of similar build quality. Like many of us with SCTs, I have bought and sold a number of f/6.3 reducer/correctors over the years, and I have always been curious how they really stack up to each other. Nebula Filters. The focal length and design working distance for this focal reducer were not available from the manufacturer. The lens is housed in machined aluminum for are machined aluminum black anodized. Focal reducers are essential optical accessories for astrophotography, electronically-assisted astronomy (EAA), and in some cases, for visual observation with long focal ratio telescopes. Celestron is considered better in terms of QA, less likely to come with free dust, hair or fingerprint. In your opinion, is the Celestron is worth the added cost ($150 vs. $90)? Copyright 2021 Stargazers Lounge EclipSmart solar products feature Solar Safe filter technology providing the ultimate protection from harmful solar radiation, including both IR and UV light, and filters 99.999% of visible light. A wider field of view and a lower magnification is also useful, with some focal reducers and with some eyepieces, for visual observers with telescopes with long focal ratios. Many reducers, such as the Celestron HD focal reducer mentioned above, and many focal reducers for apochromatic refractors, are meant to be used within a few millimeters (or less) of the specified working distance to achieve the best possible image results. However, because the field curvatures in refractors and SCTs vary a lot, I would predict unpredictable effects inre: field curvature. Thanks Peter! But the smaller image circle means there is a limit to the field stop of an eyepiece that can achieve an unvignetted image. Details: The item must be the identical item, brand name, size, weight, color, quantity and model number. 1.2" in that scope is a field stop of 43mm at f/10 and 27mm at f/6.3. 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! It seems right to put some distance between the camera and the focal reducer, right? We have placed cookies on your device to help make this website better. looks virtually identical, except for the lettering. I would pay slightly more for the Japan produced version, just because Hirsch was not bad either but sold it since I had 2 already. The most popular accessories for your new telescope! The f/6.3 reducer is operating at f/5-f/5.5 with a 2" diagonal, depending on the back focus length of the diagonal. 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. The Antares f6.3 focal reducer screws directly to the visual-back thread of all popular SCTs and converts f10 instruments to f6.3. Easy solution found a very tiny dab of super lube on the threads and all was well and quiet.. Focal reducers for SCT, RC, and field-flattened Edge HD or ACF telescopes thread onto the back of the telescope tube with 2"-24 or 3"-28 SCT threads. 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. 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. Thanks for any advice or experience you could share. But nearly every observer who installs one of these devices is pleased with their performance. Read our guide! A couple of tiny dust particles between lens elements, uneven lens edge blackening, very minor coating blemishes, or even a very small fine lens scratch or two are very common in this Antares product and must be accepted as normal for this item. The problem with those SCT reducers is that they cause chromatic aberration and require refocusing when using parfocal RGB/other filters. By So Celestron buyers like Celestron, Meade buyers like the Meade and Antares buyer like the Antares. As one increases, the other decreases. 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.
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