Assuming lens axis front tilt, here are the trade offs in choosing between a small degree of tilt (say less than 3) and a larger tilt: A small tilt causes a wider or fatter wedge but one that is far off axis from the cone of light seen by the lens. Conversely, a large tilt (say 10 degrees) makes the wedge more aligned with the lens view, but with a narrower wedge. Thus, a modest tilt is often, or even usually, the best starting point. Small and medium format cameras have fixed bodies that do not allow for misalignment of the film and lens planes, intentionally or not. Tilt/shift (“TS”) or perspective control (“PC”) lenses that provide limited movements for these cameras can be purchased from a number of lens makers. High-quality TS or PC lenses are expensive. The price of a new Canon TS-E or Nikon PC-E lens is comparable to that of a good used large-format camera, which offers a much greater range of adjustment.
Assuming lens axis front tilt here are the trade offs in choosing between a small degree of tilt (say less than 3) and a larger tilt A small tilt causes a wider or fatter wedge but one that is far off axis from the cone of light seen by the lens Conversely a large tilt (say 10 degrees) makes the wedge more aligned with the lens view but with a narrower wedge Thus a modest tilt is often or even usually the best starting point Small and medium format cameras have fixed bodies that do not allow for misalignment of the film and lens planes intentionally or not Tilt/shift (“TS”) or perspective control (“PC”) lenses that provide limited movements for these cameras can be purchased from a number of lens makers High-quality TS or PC lenses are expensive The price of a new Canon TS-E or Nikon PC-E lens is comparable to that of a good used large-format camera which offers a much greater range of adjustment