Mamiya-Sekor Shift C 50mm f4 for Mamiya 645 brand_Wimberley The lowest few speeds are

The lowest few speeds are a touch slow

a set of "creative" aperture shapes for creating weird bokeh

but there is no effect on function

quick AF-S focusing

Mamiya-Sekor Shift C 50mm f4 for Mamiya 645 brand_Wimberley The lowest few speeds areThe Mamiya Sekor Shift C 50mm f4 is a wide angle shift lens for the Mamiya 645 camera system, with up to 16mm of movement depending on lens orientation. Smooth focus, good diaphragm. No haze or fungus, some dust; there are a few internal optical marks on the very edge of one element, possibly from original assembly; they won't affect imaging, but worth knowing. Cosmetic condition is excellent.