For exact camera positioning for close-up, macrophotography and copying. Two positioning scales are perpendicular to one another. Setting range each 95 mm (3.7 in.). Prismatic precision guideways with micro adjustment across helical gear rack-and-pinion assemblies complete with lock screws and dials calibrated in millimeters. (Kaiser)
However your version has mounted in addition:
-) a rectangular gusset with 1/4" screw at base mount
-) a rectangular gusset fitting both racks
yielding a further 90░ off-set in both cases.
Last edited by AgX; 01-20-2013 at 09:51 AM. Click to view previous post history.
It appears to be for precisely positioning a camera for macro-photography. In the heyday of TLRs, a similar devise was used in macro-photography to reposition the taking lens in the same position as the focusing lens.