Flange focal distance OST-19-144, Konvas-2M, Kinor-35H cameras and lenses 61.00 +/- 0.01 mm
Focal plane PL mount standard check measure equipment.
Flange focal distance. FFD 52.000 +/- 0.001 mm.
Focal Plane micrometer, linear stage.
Metric Rectangular Gage Block Set.