Nikon MB-D15  type_Accessories 4 USM lens is a

4 USM lens is a classic 50mm f1

Honestly seems like a lot of engineering and manufacturing complexity for not a lot of payoff

Protective filter

and it works on film and digital Nikon F-mount cameras (autofocus requires a camera with a built-in focusing motor

In awesome condition

Nikon MB-D15 &nbsptype_Accessories 4 USM lens is aThe Nikon MB D15 is a vertical grip and battery holder for the Nikon D7100. It accommodates an extra EN EL3e battery with the included tray, or with appropriate carriers (not included) it'll take an EN EL4a or 6 AA batteries. This MB D15 is in very good cosmetic condition, with minor wear from normal use and handling.