Isn't this only true if there is no front rise employed?
The F-line and M-line are always Tri-axial. The M-line because it tilts at the bottom never has a
displacement requiring correction. However the F-line cameras having their rise in the front frame,
do require focus correction when rise is employed as the lens moves away from the image plane.
The Camera lens is still on plane though, so still Tri-axially correct.
The R Line camera tilt, while not perfectly having Orbix tilt, is operated as is axis tilt.
Focus near and tilt far if using the ground glass. With a digital back and the instant feedback it provides,
a table could be created for each of an owners lenses by experimentation. Once created this would
tell the photographer the degree of tilt required to reach, say infinity, for each lens, to maximize depth of field.
As there is a slight variation, specimen to specimen, in lenses, this testing would be best anyway for
sharpest performance and greatest depth of field. Longer lenses would perhaps require this more than
the shorter wide angle lenses. Once created, and given the helical rings precise focus settings for distance,
the use of the ground glass on the R camera for focusing, becomes far less of a need. The ground glass,
of course, is till the best option for precise composition.
Rod
