this needs comment, the Depth of field article is riddled with common erroeous non-factual nonsense ( like format affecting DOF, it doesnt, but magnification does.) When shooting say, near 1:4, it doesnt matter if the format is aps digital or 4x5 film, the DOF is the same. At any given magnification, changing format does NOT effect DOF, it only affects AOV.
The COC thing is simply how you MEASURE "perceived" depth of field, no matter what COC or print size you choose, it doesnt CHANGE the actual image DOF, only magnification and f-stop changes affect the image DOF. This is all based on the simple definition that DOF is the relative sharpness of the out of focus planes... JC O'Connell [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Joseph McAllister Sent: Tuesday, April 07, 2009 2:07 PM To: Pentax-Discuss Mail List Subject: Re: Trading resolution for depth of field Others, wiser than we, have already discussed this to conclusions. http://en.wikipedia.org/wiki/Circle_of_confusion http://en.wikipedia.org/wiki/Depth_of_Field Unless the changes made yesterday evening to the DoF listing were mischievous PDMLrs. :-) On Apr 7, 2009, at 05:57 , Cory Papenfuss wrote: > On Tue, 7 Apr 2009, Paul Stenquist wrote: > >> This is a simple issue. Bob is speaking of perceived depth of filed >> on a viewed print. JCO is speaking of critical depth of field in >> respect to the ability of a given lens to resolve detail. Both are >> correct, but each is discussing an entirely different matter. >> >> Let it go. > > ... but as I'm sure we will discover, only one is correct. ;-) Joseph McAllister Pentaxian http://gallery.me.com/jomac http://web.me.com/jomac/show.me/Blog/Blog.html -- 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.
