It is sure a hit or miss trying to stop this guys in flight.. Seems like they come in at 1600 MPH never in a straight line, dodging back and forth.... Way to fast for auto focus, need a high shutter speed for super clarity, high iso, grain etc... Using a long lens close and you loose DOF. Even if you have a high f stop and cut back on the telephoto. A super telephoto has it purpose. Its new to me but I have got better results other ways... good time for trial and error... always fun to learn. Can make you think...