I tested the A9 with the 200-600 f5.6 plus the Sony 1.4 TC for the afternoon falcon flying, where a long focal length is required, and the Sony could in theory get out to 900mm . The falcon test is quite demanding as the bird flies incredibly fast, and at a long distance away. The starting position is usually known though so these are slightly easier shots than the kite feeding ones. The results were very poor, with the AF points all over the place, except on the bird.