Yesterday I had the opportunity to photograph a momma bear and cubs. I burned up 150 pics before they headed off into the woods. The light forced me to shoot at 1600 ISO and (due to slow glass) shutters around 125 if I was lucky. As you can imagine my ratio of keepers to trash is not real high due to camera shake and motion of the subjects. So hear is my question. In low light (wildlife photography) do you pick the slowest shutter you can get away with to favor ISO or do you crank up the ISO to get maximum shutter speed? I will post bear pics when I get a few more processed and loaded up on my website.