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. Place the plastic covers on the lens when not in use to reduce the dust collection. I wonder whether, for example, Antares focal reducer for SCT belongs to the latter category. Optically, it consists of a four-element lens that is fully multi-coated for high contrast and resolution. The nominal design reduction factor of these reducers is typically 0.5x. Description. 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. Thanks for any advice or experience you could share. I have a made in Japan 6.3 R/C and a made in China 6.3 R/C. Ive owned Celestron, Meade, and Antares models over the years at least a couple of each. Observing the microscopic world has never been easier! 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. Focal Reducer, 2", 0.7X. I have the Antares and have no complaints. In the 1960s, Celestrons founder, Tom Johnson, created groundbreaking new telescopes never before seen on the consumer market. I've only used it a few times but it looks good to me. Please Log in to save it permanently. I happily cycle through LRGB filters to build the image rather than do a whole run of one filter at a time. Wow, that is a very detailed discussion! If I had to guess, the difference is maybe 10-15 grams. Figure 1 shows the relationship between the focal reduction factor MR and the position of the reducer in the optical path. If it's positioned further from the eyepiece or camera and closer to the telescope objective, the reduction factor increases. The equations in the Appendix show how this all works. I've seen some older threads saying that the Celestron, Meade and Antares FRs are all the same and manufactured in the same factory. High power views will provide flatter fields all the way to the edge, both visually and photographically. Celestron or Antares f/6.3 focal reducer for SCT? Is that distance D= Fo-d1=Fo-(d2/MR)? The resultant reduction factor was measured to be 0.46x. 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. So Celestron buyers like Celestron, Meade buyers like the Meade and Antares buyer like the Antares. Years ago, I bought the Antares version, and moved over to the Celestron. If you want to use them for visual - try maybe long focal length eyepieces rather than the reducer. He also holds a Ph.D. in engineering physics from McMaster University. The reducer fits all Meade and Celestron . The brightness, shape, and distortion of specific stars in the exact same position at the edge of the field was precisely identical in both reducers. The amount of reduction is simply the percentage by which a reducer shortens the effective focal length of a telescope and is calculated as (1 Reduction Factor) x 100%. Does anyone know if the Antares 4000 focal reducer is as good as the Celestron focal reducer. It works fine but you should stick with 1.25 EPs; or can use 2" EPs without corrector. It seems right to put some distance between the camera and the focal reducer, right? 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. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions. I think that the FRs made in Japan in the day may have been better. As another example,GSO makes focal reducers for their line of Ritchey-Chretien imaging telescopes. Nada. Fortunately, my neighbors are not out in their backyards at 11 pm, or they may have thought I was torturing a small mammal. By Hello! The two samples I have PERFORM IDENTICALLY. Figure 7 shows an example of an image of the Dumbbell Nebula taken with a 1.25" GSO focal reducer at a reduction factor of 0.63x with an 85mm f/7 refractor and a QHY5III-290M camera with a sensor with a 6.4mm diagonal. Please re-enable javascript to access full functionality. So it provides a 0.63x design reduction factor when used with an f/10 SCT at the specified working distance. 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. These scopes are compatibles with focal reducers. They are designed (assuming you are referring to the f/6.3 version) for the f/10 light cone. But the diameter of the image circle decreases by a factor of 0.63 to about 24mm. Celestrons FREE planetarium app is an astronomy suite that redefines how you experience the night sky. They are reported as identical. In this configuration, the 29.5mm camera nosepiece and a 6mm extension ring positions the reducer at a working distance of 53.5mm from the camera sensor, which is located 12.5mm inside the front edge of the camera. The Reduction Factor and the Amount of Reduction are inversely related. 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. Given past experience with them, I decided not to include the Meade version in my little experiment, as I have never met one I liked from getting one of the too-short focal length models, to one with some overflow cement in the doublet, to focus difficulties with some eyepieces. In some cases, focal reducers also act as field flatteners by correcting for field curvature and coma of the objective lens. Copyright 2021 Stargazers Lounge No retailers currently carry this product. The internal surfaces are blackened and glare-threaded to provide the highest contrast. In terms of reduction and correction which are what reducer/correctors are supposed to do both are superb. There are many different types of focal reducers and they all effect. The reducer is we might presume designed to correct to some as yet un-measured extent, the image of a standard SCT. JavaScript seems to be disabled in your browser. First, let's have a look at some key optical parameters are needed to understand focal reducers. And when used in some refractors, the field flattening is not as accurate as it is in the f/10 SCTs. I've never found my 0.63 reducer causing CA when used with my SCT. It can also be used with any other small chip CCD camera having a 1.25" nosepiece, such as the Celestron NexImage, Meade DSI . Regardless, the difference was miniscule and is more than adequate on both and exceeds a 8 or 6 SCTs baffle tube diameter. Perfect for the serious student, professional scientist and discriminating hobbyist. These reducers can also be used for visual observing with SCT scopes with eyepieces with a field stop as large as 24-27mm. This should not be the case if they have their purportedly different focal lengths. 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. With the barrel 1.25 reducer won't focus, all I get is fuzzy snowballs. I had a Celestron, Antares and Hirsch for awhile and compared them over about a year. For example, many focal reducers designed for f/7 or f/8 ED refractors such as those from Tele Vue, William Optics, Sky-Watcher, and Meade are designed to have a working distance (or back focus) of 55mm. We process your personal data as stated in our. Just point the telescope at any three bright objectsstars, bright planets, or even the Moonand your telescope can orient itself with the night sky. Does anyone know if the Antares 4000 focal reducer is as good as the Celestron focal reducer. However, some focal reducers can be used on other models of telescopes, but this is not always possible. I use it on my C8 SCT with a 1000d, and it seems to do everything written on the tin. Most different was that the sky background was a little darker and more uniform, providing a tiny contrast boost for fainter objects. Given the results of Test #1, I wanted to see if there was any truth to this assumption. The female end attaches to the rear cell of the telescope. 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. More details are found in the Appendix of this article. A former wireless communications consulting engineer and management consultant to various Fortune 500 companies, Manish started Agena AstroProducts in 2003. If a stronger level of focal reduction is used, say 0.5x, then the image circle may be too small to fill the sensor of larger cameras. That was fun. Free shipping $189.95 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. The new Lithium Phosphate (LiFePO4) battery chemistry has significant advantages over other battery chemistries, great for for those Astronomers on the go. With the Celestron Reducer/Corrector Lens, thats precisely what you get. If yes, what kind of focal reducers can I use? It was also a little brighter in the center of the field with subtle darkening in the outer 20% or so. For the best experience on our site, be sure to turn on Javascript in your browser. When using the diagonal, keep the field stops of the eyepieces under 20mm. My experience is that CN sellers are way above those listing elsewhere. An eyepiece with a 27mm field stop yields a true field of 1.03 in the C6 at f/10. 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! 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. Sign up for OPT news, exclusive offers, and updates on the latest gear! 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. Since the Celestron and Antares are supposed to have different focal lengths and spacing specs, I expected different results. Copyright 2003-2022 Agena AstroProducts. Getting the proper back-focus for your imaging camera is a vital step in getting the best data possible out of your telescope imaging/research rig. Such an image circle is still large enough to encompass the relatively large sensor of many deep-sky astronomy cameras. 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. Celestron or Antares? 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. This part is no longer in production, but it is sometimes available used and may be used with cameras with smaller sensors. 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. Reducer - Corrector Thanks for pointing this out. However, manufacturers virtually never provide this specification. Focal reducers also move the effective focal plane of the objective inward, that is, towards the objective (see Figure 1). Depending on the design of the telescope, they may require separate focal reducers if they require focal reducers at all. 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. 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.
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