Sorry, but you mix up sharpness with DOF - see my other post on the subject. DOF is not sharpness its "the depth of sharpness". Sharp and not so sharp lenses has the same DOF at equal settings.,This illustrates that DOF is not related to the absolute sharpness.
>Sorry Paal, reducing DOF formulas show: > > >----- Original Message ----- >From: P�l Audun Jensen <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Wednesday, October 31, 2001 10:30 AM >Subject: RE: DOF and format >size------------------------------------------------------------------ - -- > > >DOF depends of four factors only: 1) F- stop. 2) Focal lenght. 3) size of >the > >subject. 4) camera- subject distance. > >1. F-stop divided by Focal-Length equals DIAMETER-OF-APERTURE. >2. Focal-Lenth to Camera-to-Subject-Distance, or Size-of-Subject to >Size-of-Print-Image equal MAGNIFICATION >3. DIAMETER-OF-APERTURE Determines Circle-of-Confusion size on Film. >4. MAGNIFICATION determines Circle-of-Confusion size on Print. >5. VIEWING-DISTANCE of Print determines Apparent DOF. (Viewing distance is >usually considered to be 10 inches for prints up to 8x10.) > >So: DOF is determined by APERTURE DIAMETER and MAGNIFICATION! > All other values are merely derivations of those. > >--graywolf - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
