Average Camera automatically takes multiple pictures (immediately or after a timer expires), calculates the average picture out of these and normalizes the result, to make the lightest pixel become white. It is useful for producing low-noise pictures in low-light situations. Because of the long exposure time, you should not hold your iPhone in your hands, but lean it against something to get sharp results.
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Very Buggy. Support?? Crippled due to instability bugs on iPhone5s/iOS7 Slow shutter = 100% crash (regardless of the latest updated version that claims a fix) Exposure/Focus/WB lock not functional, freezes at times. Politely written support e-mail with detailed info goes unnoticed, apparently. There are much better alternatives available with greater functionality.