Mamiya 645 1000S: Calibrating Shutter Speeds on a Modified FL-400
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
Calibrating shutter speeds on the Mamiya 645 1000s. Since the first generation of Mamiya 645 models do not have removable backs, I use a dedicated shutter tester for checking and adjusting these models. The tester is a Kyoritsu FL-400 modified by the factory to Mamiya specs for the 645. It has a long reach sensor and a 40mm spacing on the sensors to measure curtain travel times in a vertical traveling shutter.
