Mamiya C 80mm Lens: Taking and Viewing Lens Focus Mismatch
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
On intake, all Mamiya C series lenses get examined to insure that the taking and viewing lenses are focusing at the same point. This particular 80mm lens was way off: as seen in photo one, the viewing lens was off by (+0.02mm) and photo two shows the taking lens off by (-0.23mm). Since tolerance is 0.015, this would be a problem. Turns out that the lens board was bent and needs replacing.
Photo three is a close up of the test fixture with the lens removed and shows the 80mm f/2.8 focus jig in place.
