>>> I'm guessing he's not seeing diffraction effects as much
>>> as sensor noise. Diffraction is a rather subtle effect, and
>>> unlikely to be a major issue at f/14.
>
>> I'm afraid, diffraction could be the major issue at f/14. Though I
>> must admit I got no experience in this area and I don't plan getting
>> any.
>
> I find I can typically use f22 without noticeable diffraction
> softening. It's probably there but largely =A0swamped by other issues in
> the lens class I deal with.

Interesting, did anybody try using something kind of The Questar
3-1/2=94 Maksutov for the purpose?

(Maksutov, not Maksimov :-)

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