SMC Pentax 50mm f1.2 Filter Type_Polarizing It's equipped with a scale-focusing

It's equipped with a scale-focusing 75mm f6

since Sigma didn't see fit to build one in for some reason

Compatible with Pentax TTL film cameras (including the 645n) and digital cameras not using the later P-TTL protocol

and the autofocus is about as good as you'd expect

SMC Pentax 50mm f1.2 Filter Type_Polarizing It's equipped with a scale-focusingThe SMC Pentax 50mm f1. 2 lens is a hefty lens, but it's not a whole lot bigger than a f1. 4 there's just a lot more glass in there. This one is in very good cosmetic condition, with minor paint wear; glass has minor dust, no haze or fungus. Image quality is excellent a little soft at f1. 2, as you might expect, but it still looks great, and sharpens up nicely by f2 if you've decided you're buying an f1. 2 lens to shoot resolution targets.