Hi Gord,

Thought there might be a simple answer but nope, there are a ton of Pentax lens formats. Here's a decoder ring.

https://www.mosphotos.com/PentaxLensesExplained.html

The lens won't be worth much today and assuming it fits a current digital model the odds of it still being a good lens aren't high. Film and digital sensors place differing demands on lenses and older zooms frequently don't perform well on digital bodies.

In sum, this lens might fit and function fully on a current Pentax model. That's no guarantee it will be as good as the super-affordable standard kit zoom that would ship with that body. If I were launching myself into the digital world, I'd start with a clean sheet and look at everything available.

Cheers,