Andrew Fildes wrote:
> I seem to remember that in the long ago and far away, Pentax made
> some filters that were distinctly curved surface.
> They had an odd name which escapes this foggy mind.
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
And I read an article once in Professional Photographer which said that
the curvature on an 'optical flat' for astronomical and scientific use
described a circle that would fit inside London. Filters were measured
to be worse...
Everything is relative...
D.
--
Donald MacDonald BA DipLIS
Two roads diverged in a wood, and I -
I took the one less travelled by,
And that has made all the difference.
Robert Frost.
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