benandbobbi

You already know that this this is heavy and expensive. What yo may not know is that looking at the pictures it produces vergen on a religious experience. Unbelievable IQ. The AF is so fast you'll find yourself jsut aiming anf pressing the shutter half way down jsut to amaze yourself at how fast a blurry scene comes into crisp clear focus. Instantanous. If handles the 1.4X and 2X like they are part of the original lens. Effortless and exacting. I've compared the images of mine to the much talked about 300 2.8 and the ones produced by the 400 are better but you have to pixel peep to see the difference. If you can afford this lens, and can handle lugging around the 13 pounds then there really isn;t another choice in my opinion.