BEFORE WE GET to iPhone-specific camera issues, let’s take a short detour to consider how camera light meters work in general and how they come up with their exposure recommendations.

The light meter in your iPhone is not that different from the light meters that have been in cameras for many years. When a digital camera (or any camera with a built-in light meter) “sees” a scene, it provides an exposure recommendation based on the levels of reflected light in the scene. Reflected light is how we see most of the world around us. Reflected light comes from a specific source (the sun, an electric light, a street ...

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