Affordable DSO Astrophotography
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Coma is driven by position & f-ratio~1 Pixel at corner of 1/3” chipf/43 mm11μ6 mm24μf/53 mm7μ6 mm15μ9 mm36μ12 mm49μ15 mm62μ9 mm23μ12 mm31μ15 mm40μTo use a Newtonian with a reasonable focal length, weneed to tame the coma on many chips (esp. DSLRs)Monday, November 23, 2009Images from James Mulherinhttp://www.opticalmechanics.com/about_coma.htm
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