This is a relatively little known but very high quality vintage mid-range zoom lens, made by Cosina for Vivitar. It is a push-pull zoom in Olympus OM mount. The lens has a 1:5 macro function and a reassuringly solid, all-metal build.

This example is in near-mint condition in its original padded box, with manual. The glass is clear. The lens movements are smooth and the rubber grip is in excellent condition.