It`s a 1972 version, going to f 32 and originally coming with the F mount (now converted to AI), 5 elements in 4 groups, 7 iris blades. The balance is fine, the lens weights about 430 grams and the A7 grip really helps holding the combo easily with one hand. This is my first Nikkor and it won`t be my last, I`m really impressed with the optical performance and the build quality is superb. The next one on the wish list is the compact 85 f2.