If you buy a Sigma or Tamron that is (for Canon), then they will work with any EOS camera, including your Rebel XS.Is the tamron and sigma compatible with a canon rebel xs? I've heard lots of good things about the L glass lenses...does the tamron or sigma compare?
That has everything to do with the shutter speed, how steady you can hold the camera/lens and the motion of your subjects. Not the lens itself.The tamron 70-200mm f 2.8 has no IS...does it still shoot crisp pics handheld?