Is full shift on a tilt shift lens increasing or cropping the focal length?

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thevisi0nary
thevisi0nary Forum Member • Posts: 94
Is full shift on a tilt shift lens increasing or cropping the focal length?

This seems like a very basic thing but I cannot find a conclusive answer. (I also don't own a tilt shift yet.) Talking only about the shift part of the lens for horizontal correction.

If I have something like the Canon 17mm TS-E fully shifted, am I effectively increasing or cropping the focal length? Or is it simply keystoning through warping the shot?

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