Re: [ATM] Looking for information on a telescope design

["Scott Milligan" <starzkey@charter.net>]

Vlad:

I've just now had the time to digest what you wrote regarding the off-axis
performance to be expected from the Mersenne design, and have an observation
to add; given that the field of view in most telescopes will be limited by
some linear format (i.e. eyepiece field stop or linear extent of CCD chip),
doesn't it follow that the off-axis contributions of the image-forming
telescope (i.e. the last section in the optical design that sees the
collimated output from the secondary)must remain fixed in magnitude?  The
magnification added by M2 simply reduces the angular extent of the true
field on the sky that can be imaged.  I do expect, however, that the issue
of field curvature will be aggravated, since the imaging component must
consist mostly of positive-powered elements, which are the wrong sign to
compensate residual field curvature added by the convex M2. 

Let us know if you see it otherwise.

Scott

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