On 6 Apr 2005 at 19:58, Don Sanderson wrote: > I know we've been through this before but would you explain > "back focus" again? My brain hurts tonite! :-)
In really basic terms consider it the distance that the rear of the lens has to move in and out to acheive focus. WA lenses move a very small distance from close up to infinity whereas a 50mm lens moves quite a distance. 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
