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. I even lost track of which reducer I was using. 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. Request stock alerts and we'll let you know when the item is back in stock. It also leads to larger (although fainter) images of extended objects like the Moon or planets for astrophotographers or visual observers. Best evidence would by obtained by using a camera and evaluating the image both by eye and with a computer analysis. I've looked through one from Meade and first impression was that it was like the Celestron version. External Focusers for Schmidt-Cassegrain Telescopes 3.1 The Basics of SCT Threads Planetarium software package which provides easy-to-understand explanations and impressive visuals of all kinds. As mentioned in Section 2.3, the reduction factor for these focal reducers can be varied by adding spacers to move the reducer further from the camera sensor or eyepiece. 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. We have placed cookies on your device to help make this website better. Celestrons patented StarSense Technology makes it easier than ever to locate objects in the night sky, even if youve never used a telescope before. Most focal reducers are designed to operate optimally at the working distance in the optical path to achieve their specified reduction factor, which is usually between 0.5x and 0.8x. For Ritchey-Chretien telescopes such as those manufactured by GSO, there are also dedicated focal reducers with a reduction factor of 0.7x to 0.8x. I was referring to the C6 to answer you specifically. 2.2 Using a Focal Reducer at the Working Distance, 2.3 Adjusting the Reduction Factor of a Focal Reducer, 3.3 Focal Reducers for Compound Telescopes, 3.5 Focal Reducers for Ritchey-Chretien and Field Flattened Scopes, 3.6 Focal Reducers in 1.25" and 2" Barrel Formats, 4. Reducer Lens .7x - EdgeHD 925 Reducer - Corrector Celestron Focus Motor for SCT, EdgeHD & 8" RASA, Celestron C6 0.63 reducer/flattener back focus. DUE TO EXTREMELY HIGH DEMAND, WE WILL NOT BE TAKING NEW ORDERS UNTIL MONDAY, DECEMBER 14. Using this same example of an 8" SCT and a 0.63x reducer, a visual observer can also enjoy brighter images and a wider field of view. Bear in mind you can't squeeze blood out of a turnip, i.e. Right off the bat, I was struck by how similar the two R/Cs were. They never really recovered from selling a few 15 years back with element reversed. I don't know. Please note, orders placed after 10am on 2/28/2023 will be delayed. Never used one, but read the reviews here that suggest a coating problem. It was also a little brighter in the center of the field with subtle darkening in the outer 20% or so. The same illumination you have at the edge of a 27mm field, the C8 has at the edge of a 38mm field. But while the image gets brighter, the size of the image circle gets proportionately smaller. I wish there was. 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 Photographically you also get a wider field and much shorter exposures. A little longer light path with a 2 Baader click-lock, low profile 1.25 adapter, and the 1.25 diagonal; 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. Clean, fun jokes the tradition continues - Page 106 But when not in the box or on the telescope, there is no cover for the other end. Thank you so much for the informative article, I now understand better how to integrate my reducer into my system to get better performance. 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 always disliked the crude, noisy SCT threads, but I get it. Things change but when I rebought I got an Antares and it seems about the same to me. So it provides a 0.63x design reduction factor when used with an f/10 SCT at the specified working distance. Focal reducers also move the effective focal plane of the objective inward, that is, towards the objective (see Figure 1). There is one difference though the Antares came with only one lens cap whereas the Celestron had a cap for both ends. No negative issues to report. because they really dont matter. All rights reserved. Images in the Celestron tended to appear ever-so-slightly dimmer (maybe? Images made with my ZWO 533 camera testing both show them to be essentially the same. WiFi technology encircles the globe in a web of connectivity, knowledge, and information. A former wireless communications consulting engineer and management consultant to various Fortune 500 companies, Manish started Agena AstroProducts in 2003. 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. Focal Reducers - Complete Overview and Function - YouTube Again, these focal reducers are often provided by the telescope manufacturer. 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. I have/had both the Celestron (Japan) and Antares units. . The most significant mechanical variation, however, is the quality and precision of the threading. The female end attaches to the rear cell of the telescope. Your mileage may vary. This article explains the basics of how focal reducers work with an astronomy telescope. 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. 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. I've seen some older threads saying that the Celestron, Meade and Antares FRs are all the same and manufactured in the same factory. Upgrading the Focuser of Your Schmidt-Cassegrain Telescope - Agena Astro 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. To calculate how much back focus spacing you need to add, take the thickness of the filter and divide it by 3. 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. Focal Reducer, 2", 0.7X - Antares Explore Scientific - Keys to the Universe Sale. These 0.63x focal reducers were originally designed to optimize for an image circle to match 36mm x 24mm film or its digital equivalent for astrophotography. 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. Get ready for a night of astroimaging with your mount faster than previously thought possible with All-Star Polar Alignment. They provide 0.75x focal reducers for these telescopes that takes an f/8 instrument down to f/6. 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. Wonder how they would stack up with a Japanese 6.3. It seems right to put some distance between the camera and the focal reducer, right? It has only one cover, which surprised me. 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. And when used in some refractors, the field flattening is not as accurate as it is in the f/10 SCTs. One of the most important factors in a telescope is its transmissionthe percentage of light that reaches the focal plane. Celestrons award-winning Nature DX binocular gets a major upgrade with the addition of ED objective lenses. Article Agena AstroProducts, 2019. Most reducers have a design reduction factor, MRD, that assumes the reducer is placed at a specific working distance, D, from the back surface of the focal reducer itself. The reducer features fully coated optics in an anodized aluminum filter ring with an ergonomic rubber grip. Please let us know what topics you are interested in. Celestron is considered better in terms of QA, less likely to come with free dust, hair or fingerprint. None of this was offensive, nor did it interfere with views in any significant way. Take control of your telescope! For visual use, this means you get lower power with the same eyepiece and a wider field of view. Possibly the design of the Antares was changed .. Some third-party vendors also make reducers for SCT scopes. Focal Reducer, 2", 0.7X. You attach the focal reducer to the rear port on a SCT and can keep it covered. StevieDvd Members 1,182 1,812 Location: Stevenage, UK Posted March 9, 2021 (edited) Don't know but your welcome to try out my Meade 6.3 sct reducer next time you are passing. For this test, I used a single configuration R/C, Click-lock, and 1.25 diagonal with the adapter. For example, a 0.8x reducer placed at the working distance provides a reduction of (1 0.8) x 100 = 20%. 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. That means the base of the mounting threads of the focal reducer needs to be 55mm from the camera sensor to achieve the design reduction factor, which is usually 0.8x or 0.85x. This part is no longer in production, but it is sometimes available used and may be used with cameras with smaller sensors. Astro-Tech Schmidt-Cassegrain f/6.3 Focal Reducer Field Flattener Orders placed after 12:00 PM Pacific Time will be shipped the next business day. Unleash the full pointing accuracy of your Celestron computerized telescope with a specialized telescope control software suite. We tested GSO's 1.25" 0.5x focal reducer at a variety of operating distances and calculated the field of view through a telescope to derive the actual reduction factor that is plotted below. They both are great and I doubt my eyes could detect a difference in any one of them including the Japan version. This is very impressive performance given how hard this problem is to mitigate in general. But I am rusty, can you condense a bit for me please? Copyright 2003-2022 Agena AstroProducts. Also read the reviews here, including those at 4 stars. My Celestron was made in China and the Antares in Canada. Because most modern Newtonians already have relatively fast focal ratios, these telescopes do not usually use focal reducers. We will match any online price that we confirm as valid. 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. Reducer - Corrector | Celestron The visual back must be removed first. The Reducer/Corrector can also be used for terrestrial digiscoping. But in the Japan version I have never noticed any anomaly like the ghosting in the China R/C. OPT Product Number: AE-SCTFR specifications Warranty 2 Year Warranty Works as advertised! Download the Celestron PWI Telescope Control Software. Reducer Lens .7x - EdgeHD 1400 Learn More. How does it look thats what matters. Years ago, I bought the Antares version, and moved over to the Celestron. But nearly every observer who installs one of these devices is pleased with their performance. Reducer Lens .7x - EdgeHD 800 Oceanside Photo & Telescope wants our customers to shop with confidence knowing that you will always get the best deal available. 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. . In your opinion, is the Celestron is worth the added cost ($150 vs. $90)? The focus barely shifts between filters and I suspect any shifts I do get are down to the filters and changes in temp. 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. Even though the manufacturer did not specify the working distance or focal length of this reducer, it is easy to see from this plot that this item provides its stated reduction of 0.5x when it is placed at a working distance of 51.5mm between the base of the threads on the mount and the focal plane of the eyepiece or camera. looks virtually identical, except for the lettering. But the diameter of the image circle decreases by a factor of 0.63 to about 24mm. We have tested our current batch and it works with Meade, Celestron, and Baader SCT accessories. Using these numbers in equation 4 in the Appendix, below, we can easily calculate that the focal length of this unit is approximately103mm (it will be 103mm plus the small amount by which the rear lens surface of the reducer is recessed beneath the reducer housing). This superb fully multi-coated multi-element focal reducer takes advantage of the latest computer aided design techniques to achieve the highest standards of performance set by the brand leaders at a fraction of the cost. Just point the telescope at any three bright objectsstars, bright planets, or even the Moonand your telescope can orient itself with the night sky. 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. 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. In such cases, we will be happy to take the item back as per our standard return terms.
Natomas Sacramento Zip Code,
Iracing South Boston Street Stock Setup,
Henry Single Shot 308 Canada,
What Does Barbary Sheep Taste Like,
Articles A
