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.
Godfrey
