Improved autofocus
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Improved autofocus

The X-T4's autofocus improves over the X-T3's in terms of both performance and usability.

The difference in performance is immediately apparent in tracking mode, with a single AF reticule sticking much more tenaciously than the 'cloud' of AF points did in the past. We've not been able to fully test this yet, as we're told full production X-T4s won't be available for a while, but it's a very promising sign: Fujifilm's autofocus has generally been very good at assessing subject distance, the main shortcoming has been the ability to stay locked onto the correct subject (hence us generally recommending using a focus zone, rather than tracking mode). Concerns about AF drive speed on some lenses persist, but we're looking forward to testing an X-T4 with the likes of the 50-140mm F2.8 LM.

The X-T4's autofocus improves over the X-T3's in terms of both performance and usability

Meanwhile the X-T4's face and eye detection systems have been improved, particularly in terms of how they're operated. Like the X-Pro3, the X-T4's face detection works pretty well and lets you drop out of face detection mode simply by operating the AF joystick. This means you can leave the camera in face detection mode most of the time, if you wish. The Face Selection mode is also pretty effective, letting you use the joystick to choose between faces or press it inwards to drop back to your underlying AF mode.

Sadly, like the X-Pro3, you can't leave the camera in Face Selection mode: you can only access it by applying it to a custom button and the camera exits the mode every time you power it off.