Re: ATM Low Cost Mirrors

["Andy Steere" <andy@www.system.missouri.edu>]

On Sun, 16 Feb 1997, Peter Hirtle wrote:

> It is interesting how so many different interpretations of the term 
> "diffraction limited" there are.  When you get right down to it any 
> aperture is diffraction limited, it may also be limited by other things 
> like roughness, astigmatism, turned edge, zones, etc.

I like Meade's the best: "Optics limited only by the laws of physics".

Very nice lawyer-approved definition.  Of course, it fails to mention that
if a mirror has 5 waves of overcorrection, rough as sandpaper, and an edge
ground flat... it's also limited by the laws of physics. 

The laws of physics say it will be BAD!!!   

Andy Steere - andy@www.system.missouri.edu