This year I was really excited about shooting this airshow with my 70-200 F2.8 IS lense! And then I had the opportunity to borrow a 2X teleconverter...things should have been great. But...I neglected to pay attention to the fact that I was losing 2 F-stops through the converter and did not pay attention to the camera which was TRYING to tell me this with a blinking 5.6 in the view finder to tell me the images were being exposed incorectly! BIG Lesson learned. Very few keepers, but here they are. Had a great day otherwise and made a few new friend. Enjoy.