The Canon 28mm f/1.8 is a small and lightweight prime (fixed focal length) lens.
Works great on crop and full frame sensor cameras, giving you 45mm on a 1.6X crop like a 40D or Rebel, 36mm on a 1.3X crop sensor such as a 1D Mark 4.
Fast and quiet USM autofocus and decent optics. Stop it down to f/2.8 for good sharpness across the frame. Great walk around lens, easily fits in your bag for traveling.
Rental includes: 58mm UV filter, pouch.