As some of you know, as the only film photographer in my family and friend circle, I get a lot of "garage" items given to me, some usable, some not. My latest "Saw this and thought of you" gift is a Vivitar wide angle 28/2.5 s/n 22316782, 62mm filter size, in Nikon pre AI mount. Anyone familiar with this lens? Is it a keeper or junk? How old is it?