On 19 Jul 2004 at 20:08, Don Sanderson wrote: > Having said what I did in my post below I guess I'm agreeing with 4 things > at once: > 1.) DOF is dependent on image size to subject size ratio, and aperture. > > 2.) That the final "working image" is dependent on FL, Distance and Format. > Smaller formats have a greater apparent DOF simply because they require a > shorter FL, at the same distance, to achieve the final "working image". Of > course this assumes the aperture is constant. > > 3.) Of course the smaller the "working image" the more enlargement is needed to > acheive the same size final image. > > I carefully didn't mention what media was used, this is agreement #4: > Doesn't matter what the media is, just how good its resolving power is. > More and Finer Grains or More and Smaller Pixels, who cares as long as it > works better!
IOW DOF scales just serve as a rudimentary guide. 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
