"Is there an adapter I can get or do I just take a free lens I can't use in stride?"
Depending on what exact mount this is (I think Brian is correct on it being for Nikon) AND if this is a lens that will work for an APS-C camera, there is probably an adapter that you could find at B&H. Some are inexpensive, some are not. Also, some lenses from different manufactures play nice with other brand cameras, some do not. I have a handful of various adapters, and often use different old lenses. Most end up being manual after mounting. I am perfectly fine with manual focus. Most people are not.
What I would do if I were in your shoes... take the lens to a local camera shop. Ask if it is worth anything in trade for a lens that will work with your camera. You might find a good discount on a new Canon EF-S lens... OR you might even find a nice used Canon lens.
Gary
Digital: Canon: R6 Mk ll, R8, RP, 60D, various lenses
Film: (still using) Pentax: Spotmatic, K1000, K2000, Miranda: DR, Zenit: 12XP, Kodak: Retina Automatic II, Duaflex III
