distortion is a term used in optics nearly always if not always associated with geometry and it doesn't improve with stopping down. jco
-----Original Message----- From: Rob Studdert [mailto:[EMAIL PROTECTED] Sent: Monday, October 18, 2004 10:54 PM To: [EMAIL PROTECTED] Subject: RE: Long zoom recommendations On 18 Oct 2004 at 22:14, J. C. O'Connell wrote: > secondly I have never a lens yet that stopping down reduced > distortion, distortion is fixed regardless of fstop. Optical distortions/aberrations other than obvious geometric distortions are often affected by stopping down. Think outside the square, this is a photo forum not a engineering meeting. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
