Sharpstar 3" Quadruplet 0.85x Reducer / Coma Corrector for f/3-f/6 Newtonian ReflectorsNewtonian reflector is one of the most sought-after astrographs among astronomy enthusiasts because it’s relatively easy to understand and operate, suitable for most amateurs. There is no sophisticated demand for a Newtonian reflector in visual observation, but when it comes to astrophotograph, a well-functioning Newtonian reflective system must be applied with a proper coma corrector.
Sharpstar 30085NTRD coma corrector can shorten the original focal ratio of f/4 to f/3.4, greatly shortening the exposure time. Besides, the Sharpstar 30085NTRD coma corrector is considerately designed with many threads. At the front of the corrector, there is M82×1 male thread for the connection to our 3" focuser. At the back of the corrector, there is tapped with M76×1 male thread, M68×1 female thread and M54×0.75 female thread, which can be used to thread on our M54 to M48 camera adapter ring. The back-focus is standard 55mm, starting from the M54 thread(camera end) to focal plane.
Note: The images show the coma corrector with a focuser. WIth this purchase, you will receive the only the coma corrector.
Note: The images show the coma corrector with a focuser. WIth this purchase, you will receive the only the coma corrector. Specifications Application:200-800mm, f/3-f/6 parabolic reflector Reduction factor:0.85× Image circle:44mm Lens:quadruplet Outer diameter:75mm Back-focus:55mm(starting from the M54 female thread [camera end]) Length:119.8mm Coating:full-surface multi-layer coatings Weight:0.85kg
Schematics
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