Fixed focus 4x5 camera

[Pfsor]

Hello from France!


Now in order to properly set your lens mount in front of your film holder, you have to take into account the film holder's depth, which is for modern film holders compliant with the ANSI standard
- 2" x 3" and 4" x 5" : 5.0 mm +- 180 microns (0.197" +-0.007")
- 5" x 7" : 5.8 +- 250 microns (0.228" + - 0.010")
- 8" x 10" : 6.6 mm +- 400 microns (0.260" + - 0.016")

- the depth of focus focus @f/16 with a sharpness criterion of 150 microns, is plus or minus 16x0.15 = plus or minus 2.4 mm; no need of a submicron caliper to properly set a working device, to re-use a well-know expression by physicist Charles H. Townes, one of the inventor of the laser: "Nothing stops naysayers like a working device" (C. Townes, 1999)

Well, theoretical mechanics also exists

Interesting. I wonder why the OP needs to know the +- 180 microns tolerance on his film holder when the depth of focus for the film is plus or minus 2.4mm...