4 ms·If you want to check for flicker, there is a great app called VISO Flicker Testerby fudged71 8y agoIf you want to check for flicker, there is a great app called VISO Flicker Testerjelder 8y agoUnfortunately the app seems to be broken on iPhone 8+. Fails with "App could not detect camera."maltalex 8y agoIt doesn't detect the camera on my iPhone :(