B.S. in capitols. DOF is format and print size independent. JC O'Connell [EMAIL PROTECTED]
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Hunt Sent: Friday, November 14, 2008 8:06 AM To: Pentax-Discuss Mail List Subject: Re: FA 1.4/50mm tested by DPReview On Thu, Nov 13, 2008 at 9:26 PM, William Robb <[EMAIL PROTECTED]> wrote: > Actually, it depends purely on the magnification ratio and alowable > COC. Focal length doesn't matter, nor does subject distance. Your statement is only an approximation, useful for close subject distances. See: http://en.wikipedia.org/wiki/Depth_of_field#Close-up "Stated otherwise, for the same subject magnification, all focal lengths give approximately the same DOF. This statement is true only when the subject distance is small in comparison with the hyperfocal distance, however." > Don't try to correct John on this, he's forgotten more than most > people know on the subject. I'm not "most people", and he's wrong. John disputes that the allowable CoC, which you mention above, varies with format. I have provided numerous sources that state otherwise, and offer clear explanations. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
