Archived posting to the Leica Users Group, 1998/04/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 08:10 AM 4/21/98 -0400, you wrote: >You are correct but that is not the question. The question is if you focus >on A and then recompose to B (without refocusing) then, if you assume a >flat field, A would be past the point of focus and B would be in front of >the point of focus. Because, assuming a flat field the point of focus is No, actually, the point of focus would be behind both objects. Because the distance to A is farther away than B. When you turn to B, the plane of focus swings perpendicular to the line from camera to B. If the lens is flat field, then the plane of focus is now farther than B, and thus behind A too. And most lenses are not terribly flat, but some of them are very flat. This is an area where you will be better off with an SLR, because you can see where the optimum plane of focus is, no matter where the subject is on the screen. Thus SLRs are given to more contemplative photography, rangefinders to more dynamic fast-happening situations. Of course, with notable exceptions on all points. ========== Eric Welch St. Joseph, MO http://www.ponyexpress.net/~ewelch I exist as I am - that is enough. - - Walt Whitman