With the Celestron Reducer/Corrector Lens, thats precisely what you get. 160K views 9 years ago This video is a complete overview of focal reducers and how they function applying to telescopes. 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. 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. A former wireless communications consulting engineer and management consultant to various Fortune 500 companies, Manish started Agena AstroProducts in 2003. Please let us know what topics you are interested in. 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. There is one difference though the Antares came with only one lens cap whereas the Celestron had a cap for both ends. They both are great and I doubt my eyes could detect a difference in any one of them including the Japan version. Many Ritchey-Chretien telescopes available today are made by GSO. 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. This innovative software solves the time-consuming problem of trying to pinpoint the North Celestial Pole. Quite interestingly it bears the very same engravings of the Meade 4000 r/c (including "series 4000") except for "MEADE". ED stands for "extra-low dispersion," which refers to the composition and optical properties of the glass used for the lenses. It must be in stock at the time of Price Match for us to make a guarantee. 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 are also less expensive than many external focusers of similar build quality. Our proprietary StarBright XLT optical coatings dramatically increase transmission, up to 97.4% on our Schmidt corrector lenses. Obviously bright objects like Jupiter or The Moon show the reflections. Have a promo code? 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. 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. No retailers currently carry this product. However, the China 6.3 R/C has noticeable internal reflections that I haven't figured out yet. It was also a little brighter in the center of the field with subtle darkening in the outer 20% or so. Completely stuck, completely frustrated. 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. Using an eyepiece with a 27mm field stop with the reducer will illuminate the edge the same as using an eyepieces with a 42.9mm field stop without it. Based on Test 1 and Test 2, I think there is perhaps more validity to opposing statements here in these forums that the Antares and current China-made Celestron do, indeed, have exactly the same optics just with different housings and branding. Meade once made an f/3.3 focal reducer for SCT scopes. 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.
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