checking alignment of 4x5 view cameras-to-copy
The "parallelism plate" in the ZP4 system (see drawing to the right) duplicates the weight distribution of a Better Light scan back and is close to the weight of other scan backs. It totally eliminates dis-assembly of the camera when checking parallelism of the CCD/film standard to the copy. A large mirror for the copy plane is provided.
To check alignment of the lens and CCD/film planes, ZP4s contain a 3.3" ring module to attach to a spare lens board that faces the square mirror on the plate.