> Who says they do?
They advertise certain resolution. I assumed it's for the final video. If they just crop it and stretch it.. that's disappointing.
When Crisp mode is used (in iPhone 5S), we use the full camera resolution (2592 x 1936 pixels) and after transforming it we project it to the output resolution (1080p, 720p). So, the final video is.. crisp :)
Who says they do? The app seems to show the entire input so I don't think there could be anything tricky in terms of using only part of the sensor.