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Re: [ATM] Lens after diagonal?
There is a scope design called a Johnsonian that is for all wants
and purposes a bent Gregorian. The secondary of the primary
mirror is a very small, 3/4 inch or less, diagonal flat. The airy disk
from this secondary is picked up by a second elipsoid primary that
then sends the image to the eyepiece. A good amount of
amplification can be realized, but you could also treat it as a mirror
based relay system. It would be an odd duck, but it would work.
Kind of looks like a T.
David Davis
Toledo, OR 97391
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