Focusing the Camera on Your iPhone X
The camera in the iPhone X can detect up to ten faces in a scene, placing a rectangle on top of each mug. Behind the scenes, the camera is balancing the exposure across each face. If you want to lock the focus and exposure settings while taking a picture, press and hold your finger against the screen until the rectangle pulses. AE/AF Lock will appear on the screen. Tap the screen again to make AE/AF Lock disappear.
The iPhone X gets a big boost from dual optical image stabilization, which uses complex algorithms to help you compensate for a case of the shakes. Meanwhile, the A11 Bionic chip, with a built-in image signal processor, can detect various elements in a scene — such as people, motion, and lighting conditions.
When a sun icon is visible, you can drag your finger up or down against the screen to increase or decrease the brightness in a scene. You can change the exposure settings of a given shot and lighten or darken scenes for both still photos and video.
The X also includes a focus pixels sensor. Think of it as a fancy under-the-hood tool to help the cameras focus faster and focus better.
And the X has not one but two rear 12-megapixel cameras, one wide angle and one telephoto. The front TrueDepth camera on the iPhone X has a 7mp sensor.
You can also exploit a feature known as HDR, or high dynamic range, photography. Tap the HDR button to turn on HDR. The HDR feature takes three separate exposures (long, normal, short) and blends the best parts of the three shots into a single image. In Settings (under Photos & Camera), you can choose to keep the “normal” photo along with your HDR result or just hang onto the latter. You can also turn on Auto HDR in Settings; if you do so, you won’t see the HDR button when shooting pictures.
The rear cameras on the X bring other goodies. The wide-angle f/1.8 aperture, telephoto f/2.4 aperture, and six-element lens perform especially well in low light.
While you’re in the Camera settings, note that you can also turn on grid lines, which help you frame a shot using the photographic principle known as the Rule of Thirds.