Mamiya G 150mm f4.5 L for Mamiya 6 studio it’s actually pretty decent

it’s actually pretty decent

They are designed to fit only a specific lens or several

Leica isn't always explicit about the intended uses for their equipment- I mean

The Leitz Canada Telyt 200mm f4 lens is designed for use with an LTM Visoflex (not included)

and though it has a manual/autodiaphragm switch

Mamiya G 150mm f4.5 L for Mamiya 6 studio it’s actually pretty decentThe Mamiya G 150mm f. 54 L is a short telephoto lens for the Mamiya 6 medium format rangefinder camera. Great for portraits, with clean glass, smooth focusing, and a good shutter. Cosmetic condition is excellent, with only minor wear. Includes front and rear caps and hood.