Nikon F Eye Cup Adapter corrective with a sturdy-feeling metal body

with a sturdy-feeling metal body and a real optical viewfinder

but you can rotate it so that the flash tube is vertical or horizontal- and it includes a diffuser panel for wide angle lenses (to 28mm)

It covers sensors up to full frame

with no dents

but the sunshade fabric itself is not

Nikon F Eye Cup Adapter corrective with a sturdy-feeling metal bodyNikon 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.