I through the Pentax 645 FA 80-160mm F4.5 on the Pentax 645z. The lens itself is rather sharp, but its HEAVY when attached to the Pentax 645z. I realized that even at 1/500 of a sec the images can have some camera shake to them as well. The lens has nice contrast and I really enjoyed shooting with it.
Here are some images from today with the lens!
Tags: 80-160mm f4.5, bitterroot, fall, fall light, horse, landscape, medium format, montana, mountains, pentax, pentax 645z, pentax FA 80-160mm f4.5, Stevensville