> fra: Godfrey DiGiorgi <[EMAIL PROTECTED]> > On Jul 21, 2005, at 6:14 AM, [EMAIL PROTECTED] wrote: > > >> fra: "Shel Belinkoff" <[EMAIL PROTECTED]> > >> > >> Last week we talked about whether or not an 18mm lens on a Pentax > >> DSLR and > >> a 28mm lens on an SLR were equivalent. Saturday my friend and I > >> tested the > >> concept. Here are the results. You decide how close the two > >> lenses are to > >> being equivalent. > >> > >> http://home.earthlink.net/~pdml-pics/2818.html > >> > >> > > As predicted, no difference other than a small shift in the crop. > > > > The next test could be to add digital compact with 28mm FOV (Ricoh > > R1v ?). If perspective depends on the focal length a 6mm should > > give some interesting results... > > Perspective doesn't depend on the focal length. I've done that with a > KM A2 ... the biggest difference is that the A2 lens isn't as well > corrected for rectlinears at the wide end as the Pentax lens, and the > A2 exhibits much more DoF due to the smaller lens opening.
I know, but it seems like some people don't and it's nice to have an example to show them. DagT
