Pat wrote:
On Feb 3, 3:35*am, (Ray Fischer) wrote:
Mr.T MrT@home wrote:
"Sir John Howard" wrote in message
This is fine if you want to reduce depth of field. However, a tilt/shift
lens is often used to increase depth of field. You cannot do that in
Photoshop with a single image.

A tilt/shift lens is primary used to correct perspective. A lens aperture
controls depth of field.

Partly true, a simple tilt-shift lens is not a complete substitute for a
full view camera with tilting film back and lensboard which DO allow the
depth of field to be non parallel to the film/image plane.
And you cannot do that with lens aperture alone.

I've taken photos that had subjects from six inches to infinity, and
even at f22 it's hard to get everything to be sharp. *Of course, TS
lenses tend to be too expensive for the occasional need.

There is software to handle the extended depth of field. You take a
series of pictures and merge them.

Ick.

Say you start by focusing 6 inches
out. Then if your DOF ends at 12", you take another picture and focus
8 inches out. If your DOF then ends at 16", your next picture is at
12" or so.

Which is okay if you have a tripod and a subject that isn't changing.
That is rarely the case for me.

--
Ray Fischer