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Apple has made a number of improvements to the iPhone 5S, but these are subtle additions rather than major overhauls. In this video, we put the 5S head to head against its predecessor, the iPhone 5, to see if it's worth an upgrade.
Of the key differences, the Touch ID fingerprint scanner is one of the biggest selling points for business users. Touch ID adds an extra layer of security by locking the device to your fingerprint, meaning data can't go astray if your 5S is lost or stolen.
Apple has also added a few extras to the camera. The firm has increased the sensor size on the iPhone 5S’s 8MP camera by 15 percent to 1.5 microns, which along with the f/2.2 aperture is designed to let more light and colour into images. The 5S also has a dual-LED flash, designed to apply exactly the right colour combination to your photo’s subject.
Our favourite additions to the camera are the Burst and Slo-Mo modes. Burst lets you hold down the shutter button and take 10 shots per second, so you can then pick the best photo.
Slo-Mo lets you shoot video at 120 frames per second at 720p, then choose a section to slow down to a quarter of the speed. For example, you could film somebody jumping from a window, or running down the street, and slow down a section to highlight their movement, or a car driving towards you, and then slow it down to see the passengers in detail.
There's also a faster processor, and the M7 coprocessor, which analyses data from various motion sensors to better preserve battery life, among other benefits.