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 > > >