Using WIDE ANGLE lenses
When using a wide angle lens, in addition to the extreme camera adjustments required necessitate a more flexible bellows than the traditional accordion configuration. The short wide-angle bellows, sometimes called a 'bag' bellows allow almost unrestricted camera movements.
A normal bellows is to long and may restrict the use of the cameras' adjustment, as may a normal length rail.
The third modification necessary to create a wide-angle camera is a recessed lens board. This special lensboard is indented 1" - 1.25" from the normal lens board plane. This allows the front and rear standards to be further apart and makes the adjustments easier.