This sale is for a really excellent condition non-metered Mamiya 645 Pro Prism Finder FP401, in perfect working order, suitable for the newer Mamiya 645 Super, Pro and ProTL cameras.
This prism has only really minor signs of use. Optically it is superb, no problems at all. Please note that you cannot use it with any of the older Mamiya M645 series cameras – the M645, M645J or M645 1000S.
Instructions for this prism can be downloaded from this website. Note that this prism does not have a light meter.