Yellow and orange members of open clusters stood out a bit more as the various stars displayed their individuality. Read our 101 article or get in touch. The reducer fits all Meade and Celestron . The naming convention of SCT focal reducers is a little confusing. The lens has a knurled surface, providing a tremendous gripping surface for threading/unthreading. Most manufacturers provide this specification. You need to be a member in order to leave a comment. I have both the Antares and the Celestron reducers. However, even though the imprint on the item states "Reducer / Corrector" please note that his is a reducer only. As mentioned in Section 2 of this guide, the reduction factor of a focal reducer depends on its position in the optical path relative to the eyepiece or camera. At a significantly lower price point, the Antares is a steal, and theres no need to upgrade to the Celestron if you already have one. The Best Dedicated Astronomy Cameras for Beginners, Astronomik OIII 12nm CCD Filter - T-Threads, Pegasus Astro Dual Motor Focus Controller, 10 Micron 12kg (26.45lbs) Stainless Steel Counterweight- GM 2000, I would like more information regarding stock availability dates. CPWI has an extensive object database, employs PointXP mount modeling, and more. . One of the most important factors in a telescope is its transmissionthe percentage of light that reaches the focal plane. They never really recovered from selling a few 15 years back with element reversed. This should not be the case if they have their purportedly different focal lengths. That includes, for example, a 1.25" eyepiece with an apparent field of view of 68 and a focal length of 24mm (eg. More important, its clear that the Antares is a reducer/corrector, just like the Celestron and not merely a reducer. The Reducer/Corrector can also be used for terrestrial digiscoping. 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. For example, with a 0.8x focal reducer, a telescope with a focal length of 800mm will operate at 800 x 0.8 = 640mm when the reducer is placed at the working distance specified by the manufacturer. Does anyone have any experience with the Celestron and Antares focal reducers? This telescope control software replaces the hand control and allows the user to remotely control their Celestron computerized telescope from their personal PC or laptop. It's highly unlikely that they could be so precisely identical unless they were. WiFi technology encircles the globe in a web of connectivity, knowledge, and information. I think there may be some confusion here, because Antares makes a variety of reducers for eyepieces and scopes in addition to this SCT R/C but this definitely is a reducer/corrector. The two samples I have PERFORM IDENTICALLY. 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. . 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. Never noticed any anomalies with this unit. As a result, the smaller tube may cut into the light cone and effectively reduce the working aperture of the telescope. Copyright 2003-2022 Agena AstroProducts. I was originally hoping to do this with a made in Japan Celestron, but ended up with a newer China version but thats probably better in the end since it is the version now available, with the Japan ones rarer and only available used. The distances d1 andd2 can also be expressed in terms of the focal length of the focal reducer FR with the lens equation: Using Equation 2, Equation 1 can also be expressed in terms of d2: The focal reduction factor of the focal reducer depends on its focal length and its distance from the focal plane of the objective as shown by Equation 4: Again, for example, when the focal reducer is placed at the original focal plane of the objective, d1=0 and MR=1, which means there is no focal reduction. It also leads to larger (although fainter) images of extended objects like the Moon or planets for astrophotographers or visual observers. Try & buy if you like - usual mates rates. 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. 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. 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. Most different was that the sky background was a little darker and more uniform, providing a tiny contrast boost for fainter objects. I also used several eyepieces including the ES 24mm/68, 17.5mm and 12.5mm Morpheuses, and a 10.5mm Pentax XL. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. I have/had both the Celestron (Japan) and Antares units. With spring galaxy season here, I decided to pick up a couple more to compare in a head-to-head shoot out. Its a good thing I have the super lube handy or my neighbors wont be happy with me.come to think of it, Im sure the small mammals here wouldnt be thrilled either! October 11, 2010 in Discussions - Scopes / Whole setups. As a consequence, the standard f/6.3 and f/3.3 focal reducers for SCT scopes do not work. I've seen some older threads saying that the Celestron, Meade and Antares FRs are all the same and manufactured in the same factory. Learn more about extra solar planets imagery, 3D Star rendering, observation planning, telescope control, multiple-panel printing, and much more. Description. Who cares? Since then, Agena has become one of the leading online retailers of telescopes and astronomical accessories worldwide. It's important to match the back focus to within a millimeter or two to get an optimal image, especially with cameras with larger sensors. 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. 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 . Today, our world-class team of optical and electronic engineers continues to push the boundaries of technology. In the 1960s, Celestrons founder, Tom Johnson, created groundbreaking new telescopes never before seen on the consumer market. The nominal design reduction factor of these reducers is typically 0.5x. All Rights Reserved. For the best experience on our site, be sure to turn on Javascript in your browser. And when used in some refractors, the field flattening is not as accurate as it is in the f/10 SCTs. Images in the Celestron tended to appear ever-so-slightly dimmer (maybe? SKU: CEL-94245. I even lost track of which reducer I was using. But the smaller image circle means there is a limit to the field stop of an eyepiece that can achieve an unvignetted image. The equations in the Appendix show how this all works. Orders placed after 12:00 PM Pacific Time will be shipped the next business day. Not a bit. Details: The item must be the identical item, brand name, size, weight, color, quantity and model number. Figure 2 shows the effective of a focal reducer on the light from a telescope objective. Thanks Peter! These reducers have a back focus (or design working distance) of 80mm. Reducer Lens .7x - EdgeHD 800 If used with other f/ratios, the field flattening characteristic may be unpredictable. Your wishlist has been temporarily saved. Reducer Lens .7x - EdgeHD 925 Learn More. You cannot, for example, use a 0.63x focal reducer intended for a standard Celestron or Meade SCT and use it on a Celestron Edge HD or a Meade ACF. It threads onto the rear cell of 5" to 16" Celestron and Meade Schmidt-Cassegrain telescopes, making it possible to have a dual focal ratio instrument without sacrificing image quality. It is recommended for . Your eyepieces are the first accessories you should learn to use with your telescope. Hmmm . For the best experience on our site, be sure to turn on Javascript in your browser. Steve Does anyone know if the Antares 4000 focal reducer is as good as the Celestron focal reducer. Wow, that is a very detailed discussion! I've only used it a few times but it looks good to me. In some cases, focal reducers also act as field flatteners by correcting for field curvature and coma of the objective lens. Equation (4) shows the relationship between the distance d2 and the reduction factor MR. 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. Go behind the scenes with Celestrons product development team and learn more about our award-winning and patented innovations. Now It only focuses near things, like some kind of macro zoom. 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. There will be no shipments on 3/1/2023, 3/2/2023, or 3/3/2023 (March 1st - March 3rd, 2023). We only send interesting emails and will never sell your data. 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 reducer is we might presume designed to correct to some as yet un-measured extent, the image of a standard SCT. Nada. Because most modern Newtonians already have relatively fast focal ratios, these telescopes do not usually use focal reducers. 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. Hence, there is a chance that you may not be able to thread your SCT diagonal or other SCT accessory on to this reducer for these or for any other brand. I doubt there is any difference between the Antares and the Celestron except price. We reserve the right to verify a competitor's advertised price and the availability of the item. Product Details 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. Sharpness is essentially the same. He tested this on an 8 Celestron , I have a Celestron 6SE. The price for an item/offer must be listed and valid at the time of match. However, manufacturers virtually never provide this specification. 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. 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. Reducer Lens .7x - EdgeHD 925 This standard distance is a consequence of the design of DSLR cameras for which the distance of the sensor to the outer edge of the flanges is about 45 mm, while the T-ring that attaches to the flange for astrophotography is about 10mm thick. I would not use the reducer with a 2" diagonal or eyepiece in the C6. I am a purely visual observer, so will evaluate for visual use only. Celestron's EdgeHD reducers feature a custom 5 element optical design engineered to maintain the flat-field performance of our award-winning EdgeHD optical system. As a Barlow's magnification increases with increasing distance from the Barlow, a focal reducer's reduction increases with increasing distance from the reducer. Because of their distinct optical design, slower Schmidt-Cassegrain telescopes (SCT) with focal ratios of f/10 require a different design of focal reducer compared to refractors. 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. 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. Regardless, the difference was miniscule and is more than adequate on both and exceeds a 8 or 6 SCTs baffle tube diameter. I think I remember hearing the reduction factor is slightly different, cant remember more or less reduction. At least these two units I tested make the answer - whatever. The C8 has no noticeable vignetting with a 32mm Plssl in the f/6.3 reducer. Enter it during checkout! Despite never removing it no matter what I was looking at. 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. Since the focal length of the reducer, FR, is fixed, as d2 increases then MR decreases. Take control of your telescope! Planetarium software package which provides easy-to-understand explanations and impressive visuals of all kinds. However, because the field curvatures in refractors and SCTs vary a lot, I would predict unpredictable effects inre: field curvature. I was referring to the C6 to answer you specifically. 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. We have placed cookies on your device to help make this website better. 800-483-6287 It must be in stock at the time of Price Match for us to make a guarantee. InternetSales@optcorp.com, 800-483-6287 Nebula Filters. With both, using the same diagonal set-up, the exact same stars were visible at the very edge of the FOV. control and Sky Viewer display makes selecting your target easy. It was used strictly for imaging, not visual observing. Dedicated focal reducers for refractors are intended primarily for imaging, not visual observation.
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