On 02/12/2013 9:41 AM, Darren Addy wrote:
Correct me if I'm wrong, but doesn't perspective distortion in
software comes at a price? Don't you end up with a trapezoidal image
shape than then must be cropped to rectangular?
Your not wrong, but your point is rather picayune
As long as you have enough resolution at the end, it's a non starter.
Also, with the newer Pentax models, you have the option of using
composition adjust, which does much the same thing as lens shift. I'm
not sure if the shift on the lens will move the image farther than using
sensor adjust in the body though.
Another possible problem comes with the DOF and orientation of the
image plane. With a T/S you have more control over the actual plane of
focus. You can place the plane of focus on the front of the building,
and use the shift to get the entire building into the frame without
disturbing that. With the photoshop solution, you need to use DoF to
cover the entire building (the plane of focus is NOT vertical, it will
be parallel to the film plane, which is tilted). Software solutions
almost require you to use hyperfocal distance on your lens.
A TS lens leaves out half of the equation, that being orientation of the
sensor/film plane. When I was shooting 4x5, I found that any tilt of the
lens almost always required a tilt of the film plane as well. Because
this can't be done on a fixed frame camera, the amount of tilt available
will be quite limited, or else the photographer is going to end up
stopping down quite a bit anyway.
TS lenses definitely have their place in limited applications, but in
applications where they are wanted, they are almost always insufficient,
and the user ends up doing some distortion correction in post, or
stopping down farther than is desirable, etc.
For a thousand dollars, a photographer who is going to make a lot of use
of this sort of lens would be better off buying a used monorail camera.
bill
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
