The reversing ring permits reverse lens mounting for maximum magnification with bellows focusing. However it is not possible to mount to a camera directly.
JP Code Mamiya Code
With 58mm filter thread 904088 304165
With 67mm filter thread 904086 304160
Right Angle Finder
This attaches to the eyepiece of prism finders and slightly magnifies the central portion of the image. It makes low angle, close up and copy work more comfortable. Unlike the waist level finder N, it provides right side up image and features, click stops and a built in diopter correction (-4 to +4). Suitable for 645 Pro and Super.