...CoC is a relative term - set seperately for each format, depending on how much you must enlarge in order to see the image at a proper size. I my world a smaller image (APS-size) should be enlarged more in order to produce an acceptable, final image. This should result in poorer overall sharpness. Why should this be regarded as more DOF??
Since the image is cropped, the DOF in the final picture SEEMS to be "better", since you most likely have croped away the unsharp edges. Still the remaining image is the same as the center part of the 35mm frame. IMO DOF does not change, just because you record the image on a sensor in stead of a film. Another reason why DOF seem to be "better" in digital recorded images (small sensors), is because we use shorter focal lengths in order to maintain the same FOV. This will cause larger DOF in the final image. But this is comparing two intirely differnt images, and this is NOT the subject here. The same lens at a given aperture still produces exactly the same image - althoug croped. Regards Jens Bladt http://www.jensbladt.dk -----Oprindelig meddelelse----- Fra: Mishka [mailto:[EMAIL PROTECTED] Sendt: 24. marts 2006 04:19 Til: [email protected] Emne: Re: crop factor vs. telephoto factor DOF != CoC best, mishka > DOF doesn't changs either. DOF is dertemined by aperture and focal length. > Nothing else. -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.3.0/290 - Release Date: 03/23/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.385 / Virus Database: 268.3.0/290 - Release Date: 03/23/2006
