Unlike most posters, I regularly hit the limits of coverage on all my lenses
(image circles of 216 to 336mm) and have been known to use a 6x7 reducing back to get more movement than is available with 4x5. For image circles around 220mm that usually means minor amounts of tilt and swing, plus as much rise or fall as the lens can handle. The larger circles support enough rise and fall that tilt or swing usually becomes the limiting factor.
The most movement I've ever used was around 50 degrees of tilt with three inches of rise and about 20 degrees of swing. That was on a near 1:1 macro and I needed the reducing back since the roughly 550mm image circle didn't cover 4x5 with that much movement.
I've not found there to be too much of an issue with large movements, other than the need to compensate for off axis light falloff on the lens as well as light loss due to bellows extension. The former is a controversial subject; see the thread on this at photo.net; http://www.photo.net/bboard/q-and-a-...?msg_id=005mUV.
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