Mamiya 6 50mm Lens: Full Open Shutter Modification
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
This Mamiya 6 50mm lens is in the shop for modification to full open shutter. I have clients who need this mod to be able to use the lenses (Mamiya 6/7) on custom equipment.
While I have done this service in different ways, I have found that removing the shutter blades is the most straightforward process for full open.
Photo five shows the front element ready to be installed with its adjusting washer. Mamiya used three different size washers: 0.3mm, 0.1mm and 0.05mm. This example has the 0.3mm washer installed. Final procedure is checking and adjusting lens focus shown in photo six.
Just for info: The shutters used in the Mamiya 6 and 7 are at their core, identical. The lenses used slightly different diaphragm resistors and the flex cable that connects the shutter to the rear contacts is a different length for the various focal lengths. Photo seven shows the 80mm flex cable compared to the 210mm cable.
