Originally Posted by StapledPhoto
Don't bump your ISO down to 50 - ISO 50 is a non-native setting for the sensor, meaning it's really just ISO 100 'pulled' down a stop as the RAW file is written, and costs you some dynamic range. Using f/11 would be just fine for a shot like the one above - with just a bird and blue sky in the (distant) background, you can't have too much DoF (and you want motion to blur the wings, anyway).
BIF, action sports, things like that are often shot in Tv mode. If you don't have time for manual adjustments, with fast moving subjects you often want to make on-the-spot decisions about how much motion blur you want to impart. In fact, if you're panning a bird across the sky, you can often manage the slow shutter for wing blur, then spin the dial and get a stop-action shot as well.
As a side note, this is one area where the 7D adds a nice feature - auto ISO works in manual mode, instead of being fixed at 400 (i.e. on a 7D in M-mode with ISO set to Auto, if you increase shutter speed by 2 stops, ISO also increases by 2 stops). Now, if the 7D only had the user-selectable max for Auto ISO that they added to the T2i... [:@]
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