I did a month long tour with just my smartphone for a camera. I put it on a Bento box on the top tube, so it was easy to grab, and the pictures came out just fine for the crazy guy blog. A fellow rider rode with an SLR, and yes, her pictures were probably better, but I prefered the convenience.
Agree with staehphj on videos. I find them totally irritating and useless. Some of 'em even make me car sick.
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Zero gallons to the mile