Leitz Elmar 5cm f3.5 (for M Mount) adapter The Nikon D7100 is a

The Nikon D7100 is a well designed DX-format DSLR that shoots 24mp stills and 1080p video at up to 30fps

Here it is

this one opens on the “back”- the side that sits closest to your body- for extra security

rather than the later A12 with its more automated loading

Leitz Elmar 5cm f3.5 (for M Mount) adapter The Nikon D7100 is aThis is an uncommon M mount Leitz Elmar 5cm f3. 5, released in 1954 alongside the M3. Leica would later produce a redesigned f2. 8 version, but this is the original from the first year of production. Just back from a full service, with smooth focusing and good diaphragm action. Very light haze and dust, no fungus or any other artifacting that will affect imaging. Cosmetic condition is very good, with light barrel wear. Includes front and rear caps.