Acer,
There is a marvelous tutorial about shift lenses on Frank Sheeran's web
site that explains how it all works with some neat graphics and the
equations for computing how much things actually shift:
http://www.bsag.ch/~fs/camera/fov.html
It does the equivalent of moving the tripod head . . . but more like as
much as 10 m, not 10 mm, depending on subject distance.
The 35/2.8 shift's light cone (or image circle) has the same total field of
view (FOV) as a 24mm focal length lens: 84 degrees. Only 63 degrees of it
fall across the film gate. In other words, you could do the same with the
24/2.8 lens and crop the image. The difference is your cropped image uses
less of the negative and therefore cannot be enlarged as much without
getting into grain.
The 24/3.5 shift works the same way by using 84 degrees of a 100 degree FOV
light cone (image circle), the equivalent of an 18mm lens.
At 07:03 5/1/00 , Acer wrote:
>
>Does shifting a shift lens (say the 35 Zuik) up or down by so many
>millimeters, say 10, correspond to changing the height of a non-shift 35mm
>lens on a camera up or down 10mm via tripod?
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