Ok, so John Lind says it so much more eruditely:
"This image has "keystoning" because the rectilinear lens did exactly
what it was supposed to do. The lens was tilted upward from dead
level. Vertical lines in the street lamp and buildings were no longer
parallel to the film plane. As soon as the camera was tilted upward,
vertical lines were no longer parallel to the film plane. The result is
converging vertical perspective lines. It looks much more natural if
they are horizontal lines; e.g. photographing the corner of a building
with roof lines converging to the ground as they recede toward the
background. Exception: a very radical tilt upward which gives the
viewer an expectation the vertical lines should converge. Avoiding
converging vertical lines is one of the reasons the shift lenses were
created.
With a rectilinear lens, the *only* parallel lines in space that will be
parallel on the film plane are the ones parallel to the film plane."
Short of $$$ for a shift lens and time to set up the tripod and adjust
the lens shift - and happening to have all that stuff as you cruise down
the street, the solution is still:
A solution is to keep the camera level and crop out the distracting
street level stuff later. Works for all WAs, of course.
Moose
Joel Wilcox wrote:
At 09:35 PM 1/2/2002 -0800, you wrote:
Some reason I like this picture quite a bit:
http://www.dragonsgate.net/richard/gaslamp.jpg Comments? I am a bit
surprised by the building distortion on the left, as I'm pretty sure
I was using the 50mm lens at that time.
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