Facetime "F" Button Meaning
The "F" button in FaceTime adds a depth-of-field effect to your call. When you tap the "F" button, the background of your video will turn blurry while anything in the foreground (including yourself) will remain sharp. You may see this referred to as aperture, or f-stop (as the button has an "F" like the "F" in f-stop), which are both terms used in photography. Adjusting the aperture/f-stop of a camera lens is what causes the depth-of-field effect. On the iPhone, this effect is simulated, so the "F" button doesn't actually have anything to do with apertures and f-stop.
How to Adjust the "F" Button Effects
Tap the F button during a FaceTime call. The background behind you in your video will become blurry, similar to when you're taking a Portrait mode photo.
Swipe down from the upper-right corner to open the Control Center. Make sure not to swipe from the top middle of the screen, as this will open your notifications.
Tap Video Effects. It's in the upper-left corner and has a green icon of a video camera.
Tap the three dots next to "Portrait". It's in the middle of the screen, under the video preview.
Drag the depth slider to adjust the amount of blur. The more you move the slider to the left, the blurrier your background will become.
iOS 17 Facetime Updates
iOS 17 added several updates for FaceTime. Besides just adding the "F" button, Apple has added these features and improvements to FaceTime: Video messages. With iOS 17, you can now leave video messages when someone doesn't pick up your call. Contact posters. The contact poster feature also works with FaceTime, and will show a custom poster when you make a FaceTime call. Silence callers you don't know. You can now automatically decline FaceTime calls from people who aren't in your Contacts. Reactions and gestures. You can now make fun effects happen on screen by tapping on a reaction or using a gesture—for example, if you make a thumbs up in a FaceTime call, you'll see a fun effect on the screen when you do so.
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