Your iPhone's Camera app has lots of neat tricks for taking photos in any environment. For most images, you can adjust the lighting and focus by tapping your iPhone's screen, though that may not be enough when you're snapping in very bright or very dark locations. In such cases you can turn to your iPhone's HDR (high dynamic range) feature. In a difficult setting with the HDR option inactive, your subject may be perfectly lit while the rest of the image is washed out, or the photo's background may be well lit while the foreground is darker and slightly out of focus.
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