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How Shift Lenses Change your Life
You'll notice now that the building is only using the top half of the film. My example image shows
beautiful green meadow, but you've got parking lots and hot dog stands. At the very least, you will have
to crop half the shot away, and enlarge your grain twice as much as needed. Is there a better way?
Film Geometry
Before looking at the real answer to this stumper, look at the numbers in image 2. "35mm" film has
images 36mm wide by 24mm tall. The "centerline" of each shot is exactly half that: 12mm down for
horizontal compositions and 18mm down for vertical compositions.
Shift Lenses
Shift lenses do a few tricks but perhaps the main professional gimmick is letting you control that
centerline. Within limits, you can put it where you want it, without changing the angle of your camera
(and screwing up the perspective).
http://www.photo.net/photo/canon/tilt-shift (2 of 9)7/3/2005 2:24:04 AM