How to adjust your iPhone camera’s settings
Unlike a compact camera or a DSLR, your iPhone doesn’t let you adjust the most popular settings: aperture, lens length, shutter speed, and white balance. That said, several tools within the Camera app (and other third-party programs) can aid you in taking very attractive pictures.
Exposure and focus
Setting your iPhone camera’s exposure (which controls the image’s brightness) is a simple matter of tapping once on whatever part of the image you’d like to source. If you move, or if the view changes too much, the Camera app recalibrates and picks a new focus and exposure point.
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