I've had my 12 Pro for close to a year. And there's definitely a flare issue under certain bright lighting conditions. For example if you're making a photo in the direction of the Sun and the Sun itself is not even close to being in the frame, you can get flare in the shape of an arc.
I attribute that to the lens housing round protrusion from the back being shiny on it's edge surface, and the protective glass surface being chamfered, transparent, and a millimeter proud of the lens housing. Strong out-of-frame light hits the shiny lens housing surface and is reflected into the protective chamfered glass surface.
I don't know if the iPhone 11 has the same protruding lens design, but if it does, that could cause flare as well. It would have been much better having the protective glass surface at the same level as the protruding lens housing, rather than chamfered and proud.
I attribute that to the lens housing round protrusion from the back being shiny on it's edge surface, and the protective glass surface being chamfered, transparent, and a millimeter proud of the lens housing. Strong out-of-frame light hits the shiny lens housing surface and is reflected into the protective chamfered glass surface.
I don't know if the iPhone 11 has the same protruding lens design, but if it does, that could cause flare as well. It would have been much better having the protective glass surface at the same level as the protruding lens housing, rather than chamfered and proud.
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