Great info Gordon! I learned something, now I need to go fly. But seriously, I have no clue about different lenses and will definitely be in touch to learn more! If I understood the lesson correctly, it sounds like the cannon 75 -300mm would be a good start for what I'm trying to do. The shots I'm having the most trouble with are the ones where I'm trying to get the pilot and plane both in the pic with the plane flying by about 20 feet away and the pilot about 50 feet away.