I've looked on Apple's site and also elsewhere and haven't seen any explanation of whether the "single shot HDR" feature in the iPhone 6 and 6+ is something they added to just the facetime camera (front facing), which maybe didn't used to have HDR (?), or if it's for the main rear camera. Or both. Why I care? Well I suppose there are advantage and disadvantages to single-shot and multi-shot.. but with single-shot HDR, at least it doesn't have to take 3 photos while your subjects are moving around. BUT - i've found no documentation that shows what method their rear camera uses. ?