i believe there are two, the 105/2 and the 135/2. i think later this month, i'm going to buy one or the other, and an 85/1.4. 135 would be be roughly 200mm with the crop factor, and that seems pretty intense for portraiture. the 105 would be ~150mm, which seems better suited. also, i've heard that chromatic abberation is or can be a problem with the 105 when focusing on closer subjects, but on the other hand, somehow, the 105 is optically better. eh? which is the better to buy?