Focus Fixtures for Adjusting Mamiya Lens Infinity
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
My once a year dusting of focus fixtures. The tools are used to adjust focus on Mamiya medium format and 35mm lenses. Each fixture has a small mirror at the bottom and a focus helix that is graduated in .01mm increments. In operation, the appropriate fixture is used to support a lens and the assembly is put on an auto collimator to check/adjust infinity focus on the lens. Tolerances differ, but a typical one would be plus .04mm to minus .02mm on a 645 lens.
