VINTAGE ZOOM VIVITAR 70-150 1:3.8

i test a cheap old zoom at the park, 35 bucks and 1976. a good match on Sony a6000 [24 mp]. critically sharp in center. this like new m42 lens is worth every penny and probably available cheaper and other mounts.
specs:
https://lens-db.com/vivitar-auto-70-150mm-f38-close-focusing-sn-22xxxxxx-1976/