I'm interested in knowing the purpose of them...is there a special mode that utilizes both of them?
NVM, answered my own question..found the answer...for anyone thats interested
http://www.phonearena.com/news/The-...pecs-release-date-and-design-pictures_id50030
"?Duo? camera - two cameras on its back
The all new HTC One will be the first phone to feature two cameras on its back. We have actually already seen smartphones with dual rear cameras, but their goal was 3D photography, while the cameras on HTC?s new big thing are said to contribute to improving traditional 2D photography rather than 3D.
The actual process of taking a photograph on the new HTC One actually looks pretty much unchanged - you see a single image through the viewfinder and you tap on a button to capture a picture. The actual benefits of the dual camera become visible once you open a captured image, as you can apply ?Duo effects? to the picture. We?d also guess that HTC has bundled in effects like post-capture focusing, a depth map and the possibility to erase objects from an image, but we are yet to see a confirmation about these features. The other changes in the actual shooting process should be in faster focusing and a more pronounced depth of field effect. We have also seen demonstrations showing how the two rear cameras can be used to achieve lossless zoom, but we don?t know whether the camera in the new HTC One will have this feature on board."
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