Another key technology Stef relies on is Dual Pixel CMOS Autofocus, available on both the Canon EOS 5D Mark IV and the EOS R. "Purists say you should always focus manually," he says, "but the technology is so good, I would never go manual any more. And with eye tracking, it's even better. I'm spoilt by Canon autofocus – it's fantastic, especially when you're in front of the camera, with a flip-out screen. I haven't got time to be messing around with the focus."
Stef is also a fan of slow motion, which he shoots at up to 100fps in 720p and then upscales for Full HD. "When things are happening rapidly, I generally switch over to it," he says.
As one of Britain's most successful vloggers, does Stef have any advice for budding filmmakers? "You need to establish what are you trying to do, then treat it like an art form," he says.
"Make sure to get the audio right," he adds. "I carry around a Zoom H6 portable recorder and use lapel mics."
You don't need a pro camera, Stef concludes, but he does recommend a camera with a flip-out screen, "like a Canon PowerShot G7 X Mark II. Get comfortable talking to the camera. Most importantly, convey truth and honesty."