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When you shoot with the iPhone's built-in Camera app, there are various ways to tweak focus and exposure, both before and after you hit the shutter. You might first tap and hold or swipe to adjust and lock focus and exposure. After the shot, you have options for adjusting saturation, contrast, sharpness, and more. Microsoft Pix (free on the iTunes Store), a photo and video shooting and editing app for iOS, doesn't want you to work that hard. It offers an effortless point-and-shoot alternative to the iPhone Camera app with a promise of superior results.