Leitz Elmar 5cm f3.5 (for M Mount) adapter this is a versatile case

this is a versatile case for all sorts of purposes

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

Here it is

though it's hard to find specs for these sorts of things

Leitz Elmar 5cm f3.5 (for M Mount) adapter this is a versatile caseThis 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.