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Although deviating from the OP's question I have a question relating to the thread title of "coma".
It is said that coma is inherent to the newtonian design, but nobody ever mentions it in relation to refractors. I remember in my younger days playing with a magnifying glass concentrating the suns rays to a point. Now when the lens is tilted so as to be no longer perpendicular to the suns rays, they no longer focus to a sharp point but display a tail which looks something like coma.
Is it the same thing or no?
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