Quote:
Originally Posted by Octane
All lenses exhibit chromatic aberration wide open, especially when they're wide open at f/1.2.
These lenses weren't created with astrophotography in mind. Stop down to f/4 or so, and you'll have much better results.
H
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Of course stop down but then I cannot go as deep on a fixed tripod - get star trails etc.
But there may be something else, When stars blow out using a long exposure (1000 Sec) on my refractor scope there is no CA at all. The 85mm shows no CA as long as the stars don't blow out.
Jeremy