On Nov 10, 2007, at 8:29 PM, [EMAIL PROTECTED] wrote: > In a message dated 11/10/2007 1:39:10 P.M. Pacific Standard Time, > [EMAIL PROTECTED] writes: > Perspective (and thus perspective distortion) is the result of the > distance and angular relationship of the camera and the subject. It > is independent of focal length and optics. > > ============ > I am going to recap, just to show I am a good student. :-) > > Also it took me a while to get this. > > Perspective doesn't change according to focal length. As Godfrey's > photos > showed. Perspective distortion is caused by the distance and the > angle (i.e. > the angle the camera is held to the subject). > > So perspective doesn't change when one uses a wide angle. > > What does change is how one shoots when one uses a wide angle. > > One may move in closer, because one can, to get the whole subject > in the > frame. By doing that one has changed the distance and probably > also the angle to > the subject. > > I think I get an A. Okay, A-. Okay, B. It took me a while. This > does give me > a clearer idea of when it will occur and when I can avoid it.
LOL ... Yes, I think you're there. ;-) BTW, if you go back to http://homepage.mac.com/godders/perspective/ and look at the first through the sixth exposures, you can see the foreshortening ... the bench (which is definitely rectangular) looks very trapezoidal in the 16mm view, by the 43mm view enough is out of the FoV that you can no longer really see the perspective distortion. Also, in the same series, you can see how the angle of the camera to the porch door makes it look decidedly un-rectangular when you know that it must be a rectangle. Godfrey -- 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.
