Thanks, I know it is a specialist lens and is a wonderful quality, very sharp with great detail and then the de-focus control an added bonus. I used it a few times as a portrait lens but my 24-70 f/2.8 seems to be permanently on the camera and on occasion I take out the 85 f/1.4 another beautiful lens, so the 105 never gets a luck in. I bought it with great intentions.