Shangara wrote>> I wouldn't go as far as saying Photoshop has a flaw when
correcting
perspective. I think it works the way it's supposed to.<<

I don't know how the designers intended it to work... but I rather expected
it do approximate what I see when I shift the front standard of the view
camera (or shift the 28mm shift lens on the Nikon)... <several minutes
later> ...  as I try to write this, I realize that it's more complicated
than it first seems...  let me back up...

When I want to photograph a building and I want the vertical lines on the
building to appear parallel, I set up the camera so that the back of the
camera is vertical... and then I shift the front standard up.  When shifting
the front standard up, the shape of the building remains exactly the same.
If it was 3 inches by 3 inches on the ground glass before shifting, it will
be exactly 3 inches by 3 inches after shifting.   When you shoot with the
camera back tilted (due to lack of shift available) and you try to fix it in
Photoshop using crop with "Perspective" checked, the job is more difficult
than a simple lens shift, but it would be nice if the math were worked out
to make it happen as if you had simply shifted the lens instead of ending up
with a building that's 2x3 inches and then needs to be stretched back to 3x3
inches.  <shrug> Is this making any sense?   Sorry if this is all completely
obvious.

Rick Lee
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www.rickleephoto.com
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