I meant to mention that one alternative to an ND filter is to use an
off-axis mask. Simply cut a hole of appropriate size in a disk that can
slip over the objective like a lens cap. Of course, if the hole has to
be round and located between the edge of the corrector lens and edge of
the secondary mirror it can't be very large. Then, again, no one said
it had to be round... or that there can only be one such hole.
Chuck Norcutt
Moose wrote:
> All mirror lenses so far are fixed aperture. Figure out how to make a
> variable aperure mirror lens that works correctly and can be
> manufactured at a reasonable cost and your fortune is made.
>
> Moose
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