DOF is in the lens image. print size whether big or small doesnt change the dof in the image. Think of DOF as the sharpenss of the forground and the background compared to the plane of focus. Thats what it is. Changing the size of the print does not effect this. Only changing the f-stop used or the magnification of the lens image relative to the object size effects the DOF.
JC O'Connell [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Peter Loveday Sent: Thursday, November 13, 2008 9:50 PM To: Pentax-Discuss Mail List Subject: Re: FA 1.4/50mm tested by DPReview > In that case, FF and aps format would be the SAME DOF, neither one > would have "deeper" dof. And print size is not a factor either. For me print size is definitely a factor. When considering if something is adequately in focus, or within acceptable DOF, it is really the final result that interests me. Of course not only print size, but viewing distance affects the overall 'enlargement' of the image... Certainly the average 10x15 print may be viewed a lot closer than a 2m x 3m wall print, and this can change what CoC is acceptable, and what falls within acceptable focus. Still, in the majority of cases, where I'm considering a 10x15 vs an A4 vs a web image, the viewing distance is similar, and acceptable CoC (and therefore DOF) varies with enlargement size. I think, for me, unless I'm contact printing from film (or sensor :), the original format is less relevant than the overall enlargement of the 'system' - that is sensor, print, viewing distance considered as a whole. - Peter -- 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.
