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Were you starting at 320ISO to maximize shutter speed? I would have thought a lower ISO at the beginning of the game and a slower shutter speed would still have been sharp.
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The clouds were going in and out, so it was changing about 2-3 stops in exposure. As low at 1/1600th and as high as 1/8000th. So I wanted to pick and ISO that would allow me to change my shutter speed on the fly and keep a nice fast shutter speed.
Canon's real full ISO marks are actually 160, 320, 640, 1250, 2500 - so your noise will be lower to be there - so that is why I usually stick with one of those.
I think that when exposed properly, iso 100 and 640 and everything in between are going to be about the same, especially considering none will be printed large.
Thanks, Sharon and Bryan. I love that last one too!