Sharpstar 2" 0.95× coma corrector can be applied to most marketable Newtonian reflective astrographs.
It’s of high quality and easy to use. Sharpstar 2" 0.95× coma corrector is designed for APS-C imaging circles(28mm), suitable for Newtonian reflectors with focal ratio between f/3 and f/6, and aperture size from 150mm to 600mm.
The reduction factor is 0.95×, thus it can reduce the original f/4, f/5 and f/6 respectively to f/3.8, f/4.75 and f/5.7, effectively shortening the exposure time. Besides, it can improve the star shapes. The diameter of stars in the center of the field can be limited within 10um.
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Specification |
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Application |
150-600mm, f/3-3/6 parabolic reflectors |
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Reduction factor |
0.95× |
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Image circle |
44mm(maximum), 28mm(optimal) |
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Lens |
triplet structure |
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Outer diameter |
50.8mm(2") |
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Back focus |
56mm(starting from the field-stop-ring to the focal plane) |
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Length |
79.7mm |
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Coating |
full-surface multi-layer coatings |
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Weight |
0.22kg |
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