"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.

MrT.