Paul, I made up some thoughts that probably show that you're wrong.
To me, solving this kind of problem by thinking is too hard, so I made a little sketch (low-fi, I know, but it's late and I wanted to share the idea) that illustrates why perspective depends on focal length.
The sketch and some explaining words are found at http://www.vollholz.de/peso/perspective.html Let me know what you think about it, pancho [EMAIL PROTECTED] wrote:
Well, yes, of course. In truth though, I only have one really long lens -- an A400/5.6 -- so I make do with that. There's no selection process involved <vbg>. My only point was that when shooting a given object at a given percentage of frame fill, the 400 quite obviously delivers a perspective on APS digital identical to that of a 600 on 35mm film. In other words, the tests that Shel is going to perform will reveal exactly that. As you and others have said, the perspective is dependent on distance from subject (and therefore FOV) rather than focal length.
