antares vs celestron focal reducer11 Apr antares vs celestron focal reducer
Obviously bright objects like Jupiter or The Moon show the reflections. 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. Since then, Agena has become one of the leading online retailers of telescopes and astronomical accessories worldwide. Focal reducers for these relatively fast ED refractors are generally for imaging only, not for visual observation. 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. A former wireless communications consulting engineer and management consultant to various Fortune 500 companies, Manish started Agena AstroProducts in 2003. This "speeds up" the optical train by reducing the focal length and magnification of the scope, requiring less time to integrate the same signal. They provide 0.75x focal reducers for these telescopes that takes an f/8 instrument down to f/6. This filter threads on to the rear cell of your Celestron or Meade SCT telescope. Dedicated focal reducers for refractors are intended primarily for imaging, not visual observation. There is a way to make subjective data more useful and that way is proper blind, or better still. Reducer Lens .7x - EdgeHD 1100. 3. Turn it on and push Align. In about three minutes, youre ready to observe! An image of about 24mm across, approximately, allows an observer to use a 1.25" eyepiece with a maximal field stop. . Product Details. But the diameter of the image circle decreases by a factor of 0.63 to about 24mm. With the Celestron Reducer/Corrector Lens, thats precisely what you get. 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. Planetarium software package which provides easy-to-understand explanations and impressive visuals of all kinds. Despite never removing it no matter what I was looking at. A reducer is a set of converging (or positive) lenses that cause the light from a telescope objective to converge at a steeper angle to the focal plane as if it were coming from an objective with a faster (lower) focal ratio and a shorter focal length. Request stock alerts and we'll let you know when the item is back in stock. My application is mostly visual now, but I'm looking to do more astrophotography over time. 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. 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. No small animals were harmed in making these observations. Thanks Peter! The author finds differences in throughput and color balance, but then says he thinks the lenses are identical and he reaches his conclusions based on very long observing session. I was referring to the C6 to answer you specifically. This rugged, 3-in-1 device features a true tactical 3-mode flashlight, a hand warmer, and a portable power bank for recharging your personal electronics on the go. 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 . 1.2" in that scope is a field stop of 43mm at f/10 and 27mm at f/6.3. Hello! Sky recognition technology that has revolutionized the manual telescope by eliminating the confusion common among beginners and enhancing the user experience for even seasoned telescope users. Quite interestingly it bears the very same engravings of the Meade 4000 r/c (including "series 4000") except for "MEADE". Possibly the design of the Antares was changed .. When you said, "in some cases" a focal reducer also works as a flattener/corrector, are you saying that not all focal reducers are flatteners/corrector? Celestrons FREE planetarium app is an astronomy suite that redefines how you experience the night sky. The stock Celestron visualback is just under 2 long. Several functions may not work. If you do so, you will achieve the design 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. More details are found in the Appendix of this article. control and Sky Viewer display makes selecting your target easy. Your mileage may vary. 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. But nearly every observer who installs one of these devices is pleased with their performance. Telescope Optics, Rutten and van Venrooij, Chapter 15, Willman-Bell (1988). There is one difference though the Antares came with only one lens cap whereas the Celestron had a cap for both ends. First, I wanted to compare the actual reduction provided by these competitors, as many threads here cite different ideal spacing from the reducer to eyepiece focal plane to achieve the correct f/6.3 result. Can you help me? Unlike SCT telescopes, Ritchey-Chretien telescopes and Celestron Edge HD or Meade ACF scopes have internal optics that provide an inherently flat field, so these telescopes require a special focal reducer than does not provide additional correction for field curvature. 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. Start Chat The same illumination you have at the edge of a 27mm field, the C8 has at the edge of a 38mm field. 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. For example, an 8" SCT without a focal reducer has an illuminated field of 38mm at 50% fall-off. They are also less expensive than many external focusers of similar build quality. 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. The Antares f6.3 focal reducer screws directly to the visual-back thread of all popular SCTs and converts f10 instruments to f6.3. Focal Reducer, 2", 0.7X. Have always disliked the crude, noisy SCT threads, but I get it. 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. 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. 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. How about for visual observers? 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. For the best experience on our site, be sure to turn on Javascript in your browser. In terms of reduction and correction which are what reducer/correctors are supposed to do both are superb. A few people have reported issues with the male SCT thread diameter on this item being a bit larger than necessary. In these equations: The combined focal length of the objective and focal reducer is given by Equation 1: For example, when d1=0, that is, the focal reducer is at the focal plane of the objective, Fcomb=Fo, so the focal reducer has no effect. Depending on the design of the telescope, they may require separate focal reducers if they require focal reducers at all. M44 was a perfect target for this, as its large size maxes out the FOV on a C8 with a corrector, and its bright stars make great targets for measuring the very edge of the visible field. 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. The Reducer/Corrector can also be used for terrestrial digiscoping. The equations in the Appendix show how this all works. I was going to measure the difference in grams, but my lovely wife caught me trying to use her precious, high-tech kitchen scale for the cause, and put the kibosh on it. Nada. 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. Reducer Lens .7x - EdgeHD 800 . No results, please adjust your filters. Your price: $579.00. Any comments gratefully received. We have placed cookies on your device to help make this website better. Focus misses by about 1 turnof the focus knob.Here is my solution:Buy a shorter 1.25 visual back for my scope. Maybe I got a lemon. For this test, I used a single configuration R/C, Click-lock, and 1.25 diagonal with the adapter. The resultant reduction factor was measured to be 0.46x. Nebula Filters. 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. 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. No negative issues to report. The design reduction factor of a focal reducer is the relative amount by which the effective focal length of the telescope is reduced when the focal reducer is used at its specified working distance or back focus. Using one on such a scope would make demands on the eyepiece design and increase the exit pupil to an extent that focal reduction on fast Newts is not practical. I've never found my 0.63 reducer causing CA when used with my SCT. However, with appropriate spacers and a camera with a known back-focus, it is easy to determine the exact amount of focal reduction for a given setup (some imaging software packages will also let you derive this from images). October 11, 2010 in Discussions - Scopes / Whole setups. I use the same back spacing for both on a small 6" Celestron SCT. The female end attaches to the rear cell of the telescope. In this case, d2 = FR/2, which means the back of the focal reducer is located at a distance FR/2 from the camera or eyepiece. Does anyone know if the Antares 4000 focal reducer is as good as the Celestron focal reducer. The click-lock with a 2 dielectric diagonal with a somewhat shorter light path, using both a 2 ES 28mm/68 and the same low-profile adapter with a 1.25 ES 24mm/68. 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. 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. The more focal reduction, the further inward the focal plane will be. 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. With spring galaxy season here, I decided to pick up a couple more to compare in a head-to-head shoot out. For me, I was looking for, and planning to keep, the one that yielded the greatest reduction. This also resulted in the clear aperture of the Antares being about 39-39.5mm, versus the Celestrons 41mm. Optically, it consists of a four-element lens that is fully multi-coated for high contrast and resolution. Is there likely to be any differences in performance between using these on an 8 or something smaller like my 6SE? Explore Scientific - Keys to the Universe Sale. Wow, that is a very detailed discussion! For imagers, the main purpose of a focal reducer is to increase the brightness of the image at the focal plane. . It's easy! Specially-designed focal reducers are available for use with these telescopes. The visual back must be removed first. Explore Scientific Keys to the Universe Sale. This was most noticeable on the eyepiece end of the RC, where the metal rim surrounding the lens was about 1mm thicker than on the Celestron. It was also a little brighter in the center of the field with subtle darkening in the outer 20% or so. From the SkyProdigy, a telescope so smart it can align itself, to our high-performance EdgeHD optical system, weve revolutionized the hobby of astronomy for beginners and advanced amateurs alike. Does anyone know if the Antares 4000 focal reducer is as good as the Celestron focal reducer. Reviews. 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. Well done. For me the Antares was a little brighter and had the least scatter by a bit so the better coatings won. These reducers can also be used for visual observing with SCT scopes with eyepieces with a field stop as large as 24-27mm. This is very impressive performance given how hard this problem is to mitigate in general. 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. 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. Anyway, when purchased my R/C the "original" Celestron unit was not readily available and was offered instead the one sold under the shop's own label (in my case Tecnosky, but I saw the same product offered under TS label). I've seen some older threads saying that the Celestron, Meade and Antares FRs are all the same and manufactured in the same factory. The lens that the ZWO comes with give a perfect wide angle image of what is in front of it. However, it will not thread into William Optics accessories, and with GSO it is a hit or miss. Stars had a tiny bit more sparkle and pop. 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. 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 1400 Theoretically each of these combinations all varied-length light paths should have resulted in slightly different reductions between the Celestron and Antares, since they supposedly have different focal lengths. Please note, orders placed after 10am on 2/28/2023 will be delayed. 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. For the best experience on our site, be sure to turn on Javascript in your browser. I've only used it a few times but it looks good to me. Many Ritchey-Chretien telescopes available today are made by GSO. They are designed (assuming you are referring to the f/6.3 version) for the f/10 light cone. There may have been an almost imperceptible difference, but the Antares and Celestron were producing precisely the same reduction.
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