> Allowance for thermal expansion/contraction of the
> lens/innards etc., I believe.
Ah, right -- I'd not thought of that possibility. One of these days I
should really get an optics book out of the library and read through it so I
can understand what's going on in this sort of situation. (all the learning
they shoved into me at school having long since faded into oblivion, sigh)
thanks!
-- dan
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