Mamiya-Sekor C 45mm f2.8 (slow diaphragm)
This is a clean Mamiya-Sekor C 45mm f2.8 lens for the Mamiya 645 camera system. No hazing or fungus, clean diaphragm blades. However, the autodiaphragm mechanism is slow enough to affect exposure, so this lens is best used in manual-aperture mode.
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