iPhoneography Quick Tip: When NOT to Use HDR on Your iPhone
http://thebeginnerslens.com/iphone-photography/iphoneography-quick-tip-when-not-to-use-hdr-on-your-iphone.html
HDR is really at it’s best when used on still scenes that have the fewest amount of moving elements. Even slow-moving objects such as clouds and leaves on trees can create ghosts in your HDR images, so there’s no hope for shooting HDR from say, a moving car. Just don’t bother.
(via Instapaper)