Surely that would be "field curvature".

regards,
Anthony Farr

----- Original Message ----- 
From: "Paul Ewins" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, December 28, 2003 11:51 AM
Subject: Pentax Patents

(snip)
> ....  Also uses "filed curvature" .....
> 
(snip)
> Paul Ewins
> Melbourne, Australia
> 
> 
> 

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