At 20:04 12/2/01, Paul Farrar wrote:
Consider shooting a tabletop shot. You tilt the lens down to make the zone in
focus lie more parallel to the table, then adjust the back tilt for
keystoning correction. With a shift, you can shift up, then point the axis
of the camera body down so that the back (and the lens) lies more parallel
to the table. This is largely equivalent to a tilt. Then you could use
Panorama Tools to undo the resulting (reversed) keystoning. PT can change
lens projection, but not where the focus was; so use your camera and lens
for that. I've tried it; it works. But since I don't have Photoshop, I
can't do the keystone correction yet, so I only get the tilt effect.
This could work with the "tabletop" macro you cite, but I don't think it
would work that well with a landscape containing great depth. The problem
is the range of distances for which critical focus is desired are at least
several orders of magnitude larger. There is far more change in critical
focus distance across the image circle by tilting the film back with
respect to the lens board. In a quick "mind experiment, a "great depth"
landscape outdoors would require a very significant tilt and an enormous
shift with a lens having an equally enormous image circle.
However, I'm going to remember this trick for macros and try the 35/2.8
shift with an extension tube some time just to see what the perspective and
DOF looks like through the viewfinder.
-- John
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|