I use the Canon EF 200mm f/2.8L-II USM Lens to take pictures of my daughter at the beach and other places where I need more telescopic power. I have a Canon EF 135mm f/2L USM Lens and it ROCKS! Between the two, I think the 135 gives better color and better focus.
Durable; Easily Interchangeable; Fast / accurate auto-focus; Strong Construction
Poor in Low Light