So I'm going to be shooting some jets on Saturday/Sunday for work. I need something that will reach at least 200mm. It needs to be quick since these will be flyby shots at high speed. I was thinking about the 18-200 VR, but I don't know if that's quick enough and I don't know if I'd be able to find one (i'm leaving tomorrow afternoon ) I currently have the 18-55 kit lens, but need something with more reach. Suggestions on lenses?