Use and customize Control Center on your iPhone, iPad, and iPod touch Turn on network settings. Airplane Mode: Instantly turn off cellular connections on your iOS device. Control audio. Press deeply or press and hold the audio card in the upper-right corner. Control with a tap. Tap the following.

Portrait mode. Image credit: Apple Depth Control Basics The faster a lens is, that is the lower the focal ratio numerically, the less depth of field it can produce. And the brighter the image. (The focal ratio, abbreviated f-ratio, is the ratio of the focal length to the effective aperture. So it’s a dimensionless number.) f/10 means the focal length is ten times the aperture and the depth of field is good. A faster f-ratio, say, f/1.4 has a focal length of only 1.4 times the aperture. Depth of field will be poor.

When the depth of field is poor, objects in the background are out of focus. This blur is often an intentional effect by the photographer. The f-ratio is reduced to throw the background into a blur when taking a portrait.

The shutter speed is then made less to compensate for the brighter image. This visual effect is called. It comes from the Japansese word boke or “blur.” How It’s Done In the iPhone XS/Max, Portrait mode, the two lenses are used together to create a depth map so that the image processor can later construct a dynamic f-ratio. (The XR manages with one lens.) That, in turn, determines how blurry the background will be. You do that in the iPhone’s Photos app, in Edit mode, by the use of the slider below the image. The available range is f/1.4 to f/16.

Depth Control Step-by-Step 1. Launch the Camera app. Swipe to get to Portrait mode. Frame, focus, and snap your photo.

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You may get warnings if you are not the right distance from your subject. Launch the Photos app. Touch and drag the slider below the image to change the f-ratio.

You’ll see the background change focus, sharper or blurrier. When you have the desired blur, tap Done. See the example below. (Thanks to Roger Rabbit.).