In a message dated 98-09-20 09:24:41 EDT, you write:
<< > > 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
>>
Maybe it's an adjustment for optimization for sharpest focus for either
terrestial distances, like between 50x, and true infinity.
Warren
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