> This leads to the question if all lenses will alow you to focus on
> astronomical infinity?
>
> Yes; otherwise you can't do distant scenery and the like.
> I was asking because in an book on Novoflex lenses they showed how to
> adjust this lenses from terrestial to astronomical infinity. Maybe the
> atmosphere is a more limiting factor in horizontal, than in vertical
> direction? So the coloured fringes might be a product of not proper
> infinty? Just a guess...
I haven't a *clue* what they're talking about. Infinity is infinity! Do
you still have the book? Can you quote what they say?
Michael A. Covington / AI Center / The University of Georgia
Author, Astrophotography for the Amateur
http://www.ai.uga.edu/~mc http://www.mindspring.com/~covington <><
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