| Don't bother with the manual settings. Go in on aperture priority and have some fun, just mind the ISO and shutter speed. Biggest tip I can give you is to get the end of your lens as close to the glass/fence/cage you are trying to shoot through and use a wider aperture. This lets the camera focus past the barrier and you don't see it in your final shot.
The following are examples of what you can get at the zoo if you use the technique above, both shot with 70-200 f/2.8L:
Last edited by SamDoe1; 01-19-2013 at 02:06 PM.