This is certainly correct, but the effect is miniscule except for the most extreme wide angles. Regards, Bob... --------------------------- "No man's life, liberty or property is safe while the legislature is in session." -- Mark Twain
From: "graywolf" <[EMAIL PROTECTED]> > Wouldn't be that simple, would it? > > The way I interpret it (and I may be wrong, after all I used to think it was > just aperture), it is more a combination of aperture and angle of view that > affects diffraction. So you can use f-stop only as an approximation, but that > ought to be close enough for most work. > > In other words a 100mm lens at f22 on a 35mm camera has slightly less > diffraction than a 100mm lens at f22 on a 6x9 camera does. Of course that is > more than offset by the higher magnification needed with the 35mm image. > > So, go ahead and use f-stop. With your istD the sensor resolution is probably > below the diffraction level at the smallest f-stop anyway, in which case you can > ignor diffraction. > Steve Desjardins wrote: > > Let me see if I have this straight: > > > > The extent of diffraction is determined by the size of the aperture but > > the effect at the film plane also depends on the focal length of the > > length. Because both of these are involved, the property I should worry > > about in terms of effect on my pictures is f stop, which is the ratio of > > these two factors. > > > > Yes?
