Description
A very popular lens for portraits. Nice build quality, all metal, long focus throw.
It's a Sonnar design derivative, the name Sonnar could not be used because it was registered for the western CZ company. So Jena decided to use "S" in the lens description. it's a fully multicoated lens (MC) in M42 screw mount. Older models weren't always multicoated.

Specifications
135mm F3.5 - F22 MC
3 elements in 4 groups
49mm filter size
6 blade aperture
90cm closest focusing
built-in telescoping lens hood

Measurements
89mm length, 430grams weight