Don Feinberg wrote --- > At the 300 end, >instead of f/22, the aperture will be closer to about f/37 to f/45. >(You can calculate for yourself the diffraction effects...) Of course, >Joe VacationPhotographer will be blithely using the lens stopped down >to try to increase "depth of field"... Not nice! Old Joe better be using fast film, because in the strongest light, he'll be at f/45 @ 1/30th with ISO 400 at 300mm, a hard call for any seasoned pro to handhold....and if there's a cloud overhead, well...the result will be impressionistic, at best. In reality, Old Joe knows nothing about DOF, and his camera rarely leaves the program setting, which is probably a good thing. --- Luis
