Philippe Le Zuikomane asked:
> I wonder if an optician can re-cut a plastic lens from
> old glasses for that purpose? Or are there special constraints
> requiring other materials?
I don't think old glasses will work.
I'm not an optician, nor do I even particualarly understand lenses, but
I think the focussing system already has lenses in it, such that the
ground glass focussing screen *appears* to be about 6' from the eyepiece
(rather than the 2" that the light actually travels!). So dioptric
correction is a little more complicated as there are other lens
alterations to take into consideration.
A good optician should be able to advise.
Regards,
Simon
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