With the iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max, Apple changed the way the Camera app’s shutter button works in ways that could cause confusion. Tapping it once still takes a single still photo, but if you press and hold on the shutter button, it now captures a quick video. (Previously, pressing and holding on the button took photos in burst mode; to do that on the iPhone 11 models, slide the shutter button to the left.) Once you’ve started taking a quick video, slide your finger to the right to lock recording, so you don’t have to keep holding the button down. Tap the white shutter button to take a still image while recording; tap the red record button to stop recording. For even easier quick video recording, press and hold either of the volume buttons; a single press still takes a photo. Note that quick videos always record with mono sound and at a resolution of 1920-by-1440; for stereo sound and the resolution set in Settings > Camera, use the Camera app’s Video mode.
If you’ve ever photographed a sheet of paper or some other rectangular object, the image may have come out skewed because you inadvertently tilted the camera. The iOS 11 Camera app has a level feature to help you avoid this problem, but it’s so subtle that you may not have noticed it. To use it, first go to Settings > Camera and turn on the Grid switch so thin white lines divide the viewfinder image into a grid of nine rectangles. Then, to access the level, hold the iPhone or iPad flat, so the camera points straight down toward the floor (or straight up toward the sky, if you’re photographing a ceiling). Notice that two crosshairs appear in the middle of the viewfinder, a yellow one that marks the position where the camera will be level and a white one that shows the camera’s current angle. Tilt the camera until the crosshairs merge into a single yellow image, and tap the Shutter button.