On Thu, Apr 15, 2010 at 12:34:59PM -0400, John Francis wrote: > On Thu, Apr 15, 2010 at 10:58:23AM -0500, CheekyGeek wrote: > > > > Well a focal length is a focal length is a focal length but if you are > > an old school 35mm film shooter then a particular lens focal length > > translates in your mind to a particular field-of-view. When you crop > > that you haven't changed the effect of the focal length (think: > > squashed depth with a particular telephoto focal length, for example) > > but you HAVE changed the field-of-view. > > Bad choice of example. > > The "squashed depth" effect is a function solely of the combination of > shooting position and angle of view, and nothing to do with focal length.
To be pedantic, angle of view doesn't really affect it, either. The relative position and sizes of the objects in the image, which is what creates the depth-compression effect, is entirely determined by the position from which the image is captured. -- 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.
