From: "John Sherman" 
To: 
Reply-To: "John Sherman" 



Hi Mark,




> angular size  of the Airy Disc  always stays the same regardless of
> telescope F#, because for a given aperture, as the F# increases so does
the
> physical diameter of the disc , so the _angular_ size, and hence angular


You used just the right words for something in my brain to click together,
and I now have a mental picture of just how this works. It is pretty
simple, I guess I was confusing too many issues, and looking at the problem
from the wrong end. Thank you. And thanks to everyone else who wrote and
helped me with this.

So Bob was right in the first place.


John

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