Mamiya m645 Prism Finder Right Angle Adapter -Clean-
This goes on the prism for the m645 (not the later Super / Pro / TL or AF models). It rotates to allow viewing from any angle. It has diopter adjustment so that most people can use it without glasses. It is perfect for low angle or vertical shooting.
This unit is in excellent condition with very light wear and the glass is clean and scratch-free. The mechanical functions are smooth.