Nikon F Eye Cup Adapter  type_Projectors The Linhof leveling head is

The Linhof leveling head is essentially a very low-profile ball head with a 15-degree range of motion

Not much to it

thumb-dial focusing and a plunger-style film winding system

this circular polarizer clips into the drop-in slot and rotates with the turn of a dial

with only very minor cosmetic surface wear

Nikon F Eye Cup Adapter &nbsptype_Projectors The Linhof leveling head isNikon F Eye Cup Adapter in excellent cosmetic condition, with very little wear. This adapter slips over the rectangular eyepiece of the F's plain eyelevel prism to allow the use of screw in eyepieces intended for Photomic prisms and later Nikon cameras. Includes original box and manual.