Trey Carroll wrote:NEVER SHOOT IN ISO 1600. Even if it's dark, invest in a tripod. It only makes the quality of your pictures decline dramatically.
NEVER SPEAK IN ABSOLUTES! (Sorry, I couldn't pass it up)
Actually it depends on the camera. Mudge has a Canon 20D, and as that's a few generations old, it could certainly be a bit better at 1600. The new one, the EOS 1D Mark III, is great at 1600.
Mudge, I was gonna mention the shutter speed thing, but I figured I'd do it through PMs. As long as we're out here, though...
You're on the right track shooting in shutter speed priority. On a sunny day, I'd dial the ISO back to 100 or 200. It doesn't matter if you have a wide open aperture, because your depth of field isn't an issue (the farther away the subject, the more your DOF lengthens, regardless of your aperture setting). Also, turn the drive up to the 'High' setting, fire off a bunch as you pan with the wircraft. Chances are in a sequence you'll get 2-3 sharp frames out of a sequence. You've got a big card, so son't worry about space.
Also, I'd try to shoot at 1/200th or around there. More prop movement. Keep in mind, though, when the Thunderbirds show up (or any other jet aircraft) you don't have a prop to worry about any more, so crank the shutter spped back up again.