Donald said:
This guy only has it half right - you have to make the hole off axis
<snip> This works well for larger astro scopes, but the
practicality is limited in the camera lens due to the small space
between the secondary mirror and the edge of the corrector lens.
-----------------------------------------------
Yes, this is pretty limiting if the aperture has to be circular. But
there's really no reason it has to be circular or that there can't be
more than one aperture. Just don't ask me to calculate the effective
focal ratio and DOF. :-)
Chuck Norcutt
Woburn, Massachusetts, USA
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