The iPhone X offers some impressive video recording specs, including 4K/60p capture, slow-motion capture at up to 1080/240p, and optical image stabilization during recording. It can also record in a highly compressed 'HEVC' (H.265) format, which saves lots of space (and is required for 4K/60p), but at the expense of requiring conversion to a more established format for viewing on most other devices. That being said, importing a 4K/60p file through Image Transfer on Mac OS X automatically generated an H.264 file that played just fine on an older iMac. Those on Windows, however, will need to manually use conversion software to view the video files at this time.

Pay careful attention to the smooth gradations in the sky, and the quality of the moving water. Click here to download a higher quality 100mbps file. You can also download the original HEVC file, which uses a more efficient compression algorithm, here.

In use

As you would expect for a smartphone, the iPhone X is really geared towards point-and-shoot or run-and-gun video capture. Once you're in the camera app and recording video, you have no control over exposure settings, besides of course tapping on subjects on the screen to tell the phone to expose properly for that subject. A long 'press' will lock exposure and focus at that point.

Download a high-quality 100Mbps version of this video here.

Rather annoyingly, you cannot change your video quality from the app, even though it displays the chosen quality on the top of the screen. You would think that tapping that would bring up a drop-down menu of options, but no, you have to head into the phone's (very crowded) overall settings menu to swap from Full HD to 4K, for example.

The optical stabilization is impressive overall, though it seems just slightly less effective at 4K/60p than in other modes. Be aware that at 24p / 30p, you may notice some 'juddering' in bright light, likely due to the camera having to use a high shutter speed coupled with a relatively slow frame rate. Shooting in either 1080/60p or 4K/60p smooths things out noticeably.

Download a high-quality 100Mbps version of this video here.

Exposure is generally solid, and autofocus generally snappy in good light, but there's also a lot of depth-of-field from these smaller sensors, so focus shouldn't be too big a challenge anyway. Unfortunately, as light levels drop, the focus tends to hunt, and can be a distraction in your footage (if not ruin it outright).

Lastly, you'll see some unpredictable white balance shifts in the sample clip above, and some noticeable rolling shutter. Overall, though, the video quality the iPhone is capable of is very impressive indeed.