Carl Zeiss Planar 50mm f1.4 ZE T* for Canon EF lens mount_Mamiya RB It's nice and compact

It's nice and compact

which still provides metering but does not enable aperture-priority AE

This tube will give you an additional 82mm- a substantial amount when combined with the RB's already impressive built-in bellows extension

but may include annotations

Carl Zeiss Planar 50mm f1.4 ZE T* for Canon EF lens mount_Mamiya RB It's nice and compactThe Carl Zeiss Planar 50mm f1. 4 ZE T* is a fast, compact manual focus lens designed for use on Canon EF mount cameras. Clean glass, smooth focusing, and classic Planar image quality, all in a handsome black metal body. In excellent condition, with only the most minimal cosmetic wear. Includes lens hood.