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What’s changed with iOS 4’s Photos app
Inspired perhaps by the powerful new camera featured in the forthcoming iPhone 4, Apple has added some new features to iOS 4’s Photos app. The biggest change will be familiar to iPad users: The addition of Events, Faces, and Places support. While you can’t create new events or tag faces on the iPhone, you can sync existing collections from iPhoto or Aperture.
How To Zoom With Iphone Camera