RB67 140mm f/4.5 Macro: Locating Pin Replacement and Fungus
Originally posted on Instagram. Notes from the repair bench, kept here as a searchable archive. View the original on Instagram
Servicing a Mamiya 140mm f/4.5 Macro lens for RB67. Replacing a damaged lens locating pin, removing and cleaning lens lock ring and cleaning fungus from inner floating element (95% of the fungus cleaned up, some very slight damage to the glass).
In the second photo you can see the lens locating pin at the twelve o’clock position on the rear of the lens. The pin base is adjustable so after replacement you need to check for proper location. As seen in the first photo, the lens is installed on a fixture to check cocking angle-the lens should cock at 106-109 degrees. While you can check the cocking angle on a body, you are then putting the body condition into the equation so there could be an error.
