Quote:
Originally Posted by barx1963
For a newtonian (and dobs are a form of newtonian) only coma is affected as they do not suffer from chromatic aberrations.
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From my understanding Newts do suffer from-
1/ Spherical Aberration which causes a halo effect around bright objects
Eg Jupiter.
2/ Astigmatism which causes points of light to look like triangles or crosses.
3/ Coma which causes comet tails.