Ricoh Rikenon 135mm f/2.8 XR is telephoto prime lens for 35mm SLR cameras.
The body is made of metal, with a sturdy "diamond" pattern rubber focusing ring.
From 1980 brochure:
Quite possibly the most popular choice after the standard lens, the 135 f/2.8 telephoto is ideal for portraits, indoor and outdoor sports, landscapes, and other long distance subjects. With 4 elements in 4 groups, this lens is both compact and bright, with a maximum aperture of f/2.8 for low-light versatility. A built-in lens hood is included.
Posted by: btzb Date of publication: 16.06.2017