The Canon Serenar 85mm F2
This is a Lens I fell in love with fast, it does a great job of isolating a close subject, is easy to focus, and even through it weights a ton I enjoy using it.
Year Introduced: 1948 Focal Length: 85mm Design/Mount: 6 elements in 4 groups / Screw-Mount (SM) Minimum / Maximum aperture:- f/16 ~ F/2.0 Closest focusing distance: approx. 1.07m (4 ft) Filter attachment size: 48mm Dimension/Weight:- no info / 556g but weighs lighter at 615g. Remarks: It has another all chrome MK II version lens occurred update in 1951