From: lifedata{at}vol.com
To: atm{at}shore.net
Reply-To: lifedata{at}vol.com



>Clearly the full aperture of a typical diagonal isn't used to form the
>image of  a single star, or even two closely placed stars, so, for fine
>detail resolution,  one need only consider the error over a portion of
>the diagonal, but it isn't a  tiny portion, it is a fairly sizable
>amount like 3/4 or 2/3.

Not to mention the fact that not all telescopy is specifically concerned
with individual stars.  The sharpness of planetary telescopy is also a
subject.

Jim L

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