RE: [ATM] Is There a Difference

["Jerry" <wa4guu@verizon.net>]

James ....

Did you refocus for off axis?

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
James Lerch
Sent: Friday, July 08, 2005 3:16 PM
To: ATM
Subject: Re: [ATM] Is There a Difference

----- Original Message -----
From: "Richard Schwartz" <richas@earthlink.net>


> In optics we have the Ray-Lee criterion:   if the optical path difference
is
> less that 1/4 wave, the optical system is indistinguishable from perfect.

Isn't this only true for On-Axis image?

My most recent post showed a 1/4 P-V wavefront 6" F/8 (@550nm) was only 
diffraction limited for a measly 1/20 degree field of view.  Where as a 1/10
P-V 
wavefront 6" F/8 (@550nm) was diffraction limited to nearly 1/2 degree field
of 
view.

Did I make an error somewhere?

Take Care,
James Lerch



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