In a message dated 12/4/98 1:37:38 AM Eastern Standard Time,

<< You and I have the same OTA - 127ed - but they must have put very
different objectives in them. I just got in from observing the edge of
Selene (great libration!) and found the color to be quite
objectionable. My Genesis (original, non-sdf version) has less.

-- Paul Sterngold

>
> Well......as far as Achromat to APO.....I'm not going there again.
> But I'm more interested in telecompression for photography rather than
> fixing a color problem that I don't have. :))
>
> m. >>

More likely you were born with different eyes, particularly at the violet end
of the spectrum....but one thing is certain: an f/9 ED doublet can never be as
well color-corrected as a properly designed 5-element system which I believe
is what Valery's corrector is alleged to give you.

John

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