My camera is a Canon 40D, and I've been experimenting with different lenses lately. I'm trying to find one that the Subi oval security people don't freak out at. I've got a really good quality lens (70-200), but that looks too obvious, so I generally take a Tamron 18-250 that looks inconspicuous. WAFL is much easier - they don't care what sort of camera or lens you're carrying!