On 30 Mar 2005 at 23:21, Godfrey DiGiorgi wrote: > What is a "rated focal length"? > > How do you use a lens at anything other than its actual focal length? > Whether projecting onto a 16x24mm format or a 24x36mm format, a lens' > focal length does not change.
I assume that Tom's comment meant to something like "the lenses design coverage and suggested AOV on a 35mm frame", that sounds reasonable, not too perplexing. 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
