We will be glad to help. Our proprietary StarBright XLT optical coatings dramatically increase transmission, up to 97.4% on our Schmidt corrector lenses. In terms of reduction and correction - which are what reducer/correctors are supposed to do - both are superb. The C8 has no noticeable vignetting with a 32mm Plssl in the f/6.3 reducer. Contiguous US Customers:All items we sell ship for free within the Contiguous US. Since 2008, Brian has taught astronomy to tens of thousands of stargazers through his websites OneMinuteAstronomer.com and CosmicPursuits.com. Reducer Lens .7x - EdgeHD 1100. 1.2" in that scope is a field stop of 43mm at f/10 and 27mm at f/6.3. 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. Some manufacturers will specify the working distance from the middle of the rear lens surface, and this number must then be converted into a practical working distance number by subtracting the amount by which the rear lens surface is recessed in its housing. So ab6110 is asking for a FR only without coma correction, there are a couple of brands who make special reducers for the ACF. Have a promo code? Upon close inspection, it was clear that the housing of Antares assembled in Canada version was a little more substantial than the Celestron. Equation 6 & 7 item two & three does not make sense, both say increase its reduction (one should say reduce its reduction?). A f/10 focal ratio now achieves a f/6.3, while an f/11 focal ratio now achieves a f/7. Because most modern Newtonians already have relatively fast focal ratios, these telescopes do not usually use focal reducers. The same illumination you have at the edge of a 27mm field, the C8 has at the edge of a 38mm field. Request stock alerts and we'll let you know when the item is back in stock. The Antares f/6.3 Focal Reducer for Schmidt-Cassegrain Telescopes is a low-price option for reducing the focal length of your Schmidt-Cassegrain telescope from f/10 to f/6.3. The equations and argument in the Appendix of this article shows the relationship between the working distance and the reduction factor. Enter it during checkout! Fortunately, my neighbors are not out in their backyards at 11 pm, or they may have thought I was torturing a small mammal. Torazz As I understand it, compared to the old Meade SCT's, the ACF is already "coma corrected", so the standard Meade, Celestron etc F6.3 focal reducers are not suitable and will only worsen the images. For imagers, the main purpose of a focal reducer is to increase the brightness of the image at the focal plane. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.International Customers:Free shipping does not apply to international orders. Generally, views through the Antares seemed a little more transparent and brighter. Since the focal length of the reducer, FR, is fixed, as d2 increases then MR decreases. But in the Japan version I have never noticed any anomaly like the ghosting in the China R/C. The most popular accessories for your new telescope! This part is no longer in production, but it is sometimes available used and may be used with cameras with smaller sensors. Great report and verifies what I had thought all along, Fortunately, my neighbors are not out in their backyards at 11 pm, or they may have thought I was torturing a small mammal. Depending on the design of the telescope, they may require separate focal reducers if they require focal reducers at all. There are also third-party vendors such as Hotech. The focus barely shifts between filters and I suspect any shifts I do get are down to the filters and changes in temp. Not one detectable iota of discernable difference. The internal surfaces are blackened and glare-threaded to provide the highest contrast. We only send interesting emails and will never sell your data. The Reducer/Corrector can also be used for terrestrial digiscoping. 3. I also used several eyepieces including the ES 24mm/68, 17.5mm and 12.5mm Morpheuses, and a 10.5mm Pentax XL. 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. No negative issues to report. For the best experience on our site, be sure to turn on Javascript in your browser. 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. Despite never removing it no matter what I was looking at. Hi. This "speeds up" the optical train by reducing the focal length and magnification of the scope, requiring less time to integrate the same signal. With both, using the same diagonal set-up, the exact same stars were visible at the very edge of the FOV. 2023 Celestron, LLC. 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. 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. Explore Scientific - Keys to the Universe Sale. I think that the FRs made in Japan in the day may have been better. (Note: Using the simple equations above, the focal length of this reducer can be estimated to be about 350mm). Oceanside Photo & Telescope wants our customers to shop with confidence knowing that you will always get the best deal available. We reserve the right to verify a competitor's advertised price and the availability of the item. Housings, threads, reduction, correction, blah, blah, blah. Copyright 2021 Stargazers Lounge 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. It is recommended for . The key points are as follows: So just remember that a smaller distance (from the camera or eyepiece) means a lower amount of reduction (and vice versa). The reducer features fully coated optics in an anodized aluminum filter ring with an ergonomic rubber grip. But while the image gets brighter, the size of the image circle gets proportionately smaller. Focal reducers also move the effective focal plane of the objective inward, that is, towards the objective (see Figure 1). In most cases, the easiest option is to choose the focal reducer made specifically for your telescope. 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. 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. During a twenty-year scientific career, he developed laser systems to detect molecules found in interstellar space and planetary atmospheres, and leveraged his expertise to create laser technology for optical communications networks. 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. How does it look thats what matters. Keep in mind that these differences were very subtle, and could be due to normal variations in coatings among different runs, and not necessarily unique to the brands. 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. If the focal reducer is to be used for visual observation, the visual back is threaded onto the eyepiece side of the reducer, and then a star diagonal and eyepiece are installed as usual. Description. This appendix summarizes how this works based on simple equations from the book Telescope Optics by Rutten and van Venrooij. This is the distance at which the reducer must be placed in front of the eyepiece or camera focal plane in order to operate at the design reduction factor. Meade and Celestron both sell such SCT-T adapters with the correct optical length. Never used one, but read the reviews here that suggest a coating problem. Try & buy if you like - usual mates rates. Overall, this reducer does a phenomenal job at preventing gradients due to internal reflections from the camera sensor back to the glass in the reducer, as I suffered with the Antares reducer. I've seen some older threads saying that the Celestron, Meade and Antares FRs are all the same and manufactured in the same factory. Dedicated focal reducers for refractors are intended primarily for imaging, not visual observation. 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. You currently have javascript disabled. Many focal reducers are meant to be used within a few millimeters of the specified working distance to achieve the best possible image results. 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. A longer effective focal length leads to higher magnification with a given eyepiece for visual observers. Telescope Optics, Rutten and van Venrooij, Chapter 15, Willman-Bell (1988). Figure 1 shows the relationship between the focal reduction factor MR and the position of the reducer in the optical path. The more focal reduction, the further inward the focal plane will be. 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! 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. A slight nod to the Antares for heft and higher transmission, but points to the Celestron for nice threads and better contrast. He received his first telescope at the age of 5 and completed his first university course in astronomy at the age of 12, eventually receiving a master's degree in the subject. 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. which looks like the same one. Here, there was a subtle difference . because they really dont matter. I think I remember hearing the reduction factor is slightly different, cant remember more or less reduction. As often noted in reviews and forum threads, Antares products tend to have threads that are a little less precise, and this specimen certainly demonstrated this. Wonder how they would stack up with a Japanese 6.3. My application is mostly visual now, but I'm looking to do more astrophotography over time. Celestrons patented StarSense Technology makes it easier than ever to locate objects in the night sky, even if youve never used a telescope before. I happily cycle through LRGB filters to build the image rather than do a whole run of one filter at a time. Reducer Lens .7x - EdgeHD 1100 Learn More. They are commonly available in 1.25" and 2" threaded cells that conveniently thread into the nosepiece of a compatible camera or the barrel of an eyepiece. Easy solution found a very tiny dab of super lube on the threads and all was well and quiet.. 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. Like you, I am primarily visually observing but I have everything together now that so I am going to start experimenting with photography so we'll see how it does there. Please Log in to save it permanently. First, let's have a look at some key optical parameters are needed to understand focal reducers. Sign up for our newsletter to get exclusive deals, observing tips, and new product announcements. Therefore, a 55mm back focus with a filter that is 3mm thick added to the imaging train would become 56mm. 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. I don't know. 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. Several functions may not work. You may need spacers or a T-adapter to ensure the correcting working distance. How about for visual observers? Please re-enable javascript to access full functionality. looks virtually identical, except for the lettering. You can probably eke out 1.2 without noticing serious vignetting, which is a field stop of 31.5mm. 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. However, manufacturers virtually never provide this specification. Powered by Invision Community. The Buyer's Guide To Eyepieces at the top of the Eyepieces forum has a column for this spec. Can you help me? Performance wise what differences might there be using the reducer on a smaller scope. - thanks. You don't need to follow these equations to use a focal reducer, but they do show how the reduction factor changes with the placement of the reducer. On the camera side, the focal reducer has male M42x0.75 or M48x0.75 threads that attach directly to the T-ring (with an M42-M48 adapter if necessary). We have tested our current batch and it works with Meade, Celestron, and Baader SCT accessories. * Not a Retail Store * 16313 Arthur StreetCerritos, CA 90703, USA. 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. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. Our patented SkyAlign alignment technology makes setting up a computerized telescope simple, fast, and accurate. Not noticed any optical problems. The resultant reduction factor was measured to be 0.46x. The Antares f6.3 focal reducer screws directly to the visual-back thread of all popular SCTs and converts f10 instruments to f6.3. if the illuminated field is 27mm wide without the reducer, it will be 27 x 0.63 = 17mm with it in place. However, the China 6.3 R/C has noticeable internal reflections that I haven't figured out yet.
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