Apple over the weekend published a new support document on its website that provides details on issues with camera flare that customers have been experiencing with the iPhone 5. Users have been reporting a purplish tint appearing on certain pictures depending on how the camera was angled.
Apple claims in the document that the flare is normal, and can be avoided by slightly angling the iPhone away from the light source.
Most small cameras, including those in every generation of iPhone, may exhibit some form of flare at the edge of the frame when capturing an image with out-of-scene light sources. This can happen when a light source is positioned at an angle (usually just outside the field of view) so that it causes a reflection off the surfaces inside the camera module and onto the camera sensor. Moving the camera slightly to change the position at which the bright light is entering the lens, or shielding the lens with your hand, should minimize or eliminate the effect.