I impulse bought a used 180mm f2.8 (Auto P), Which truthfully I know nothing about, But I figured I couldn't go wrong with this either for film B&W portraits, OR just for messing around on my D50 or D70s (I know it won't meter). Might use my Sigma 1.4x teleconvertor if it fits to make it a 252mm f4 aswell. But what I'm basically asking is if anyone knows much about this lens? I won't have it till the end of next week anyway, But Everyone raves about the newer versions of this lens. And from the little I've read online it sounds like the glass on this is basically just as good. Any comments or suggestions?