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Here is a link. This manual is for the Extension Tubes 1, 2, 3 and 3-S for a Mamiya 645camera: the variants on the 1000S model camera, should Mamiya RB67 accessories, Mamiya RZ accessories, Mamiya 645 Accessories, Mamiya 645 Power Drive Grip WG401, Mamiya RZ67 Auto Extension TubesThis sale is for a complete set of genuine Mamiya 645 Auto Extension Rings No. 1, 2 and 3-S to fit all of the Mamiya 645 manual focus cameras – M645, M645J, Does anyone know where I might find a user manual for the manual focus Mamiya 645 extension tubes? I looked around the Mamiya site but didn't find much