Quote Originally Posted by jrw View Post
The shutter speeds for many of the pictures are long for a non-IS lens. Minimum shutter speeds recommended for hand holding are 1/(focal length x crop factor if any).
I just want to add that this is minimum recommended shutter speed is for static, non-moving, subjects. As soon as you have people or animals moving, you're going to want something a bit faster. How much faster depends on the focal length and subject speed, and how large your final image needs to be.

Also, don't be afraid of higher ISOs. On a 1DsmkII, I use ISO 800 regularly, and 1600 if needed, and get nice sharp shots. A 5DmkIII has significantly better handling of higher ISOs. Figure out what ISO you're happy with (after noise reduction), which are ISO is acceptable if you really need the shutter speed higher than what you're happiest using, and at which ISO you might as well not even bother trying to shoot.