The X-T4 utilises the high-speed performance of the X Trans CMOS 4, which is a back-illuminated structure and features phase-detection pixels across the entire sensor. Combined with a new advanced AF algorithm and the X Processor 4, the camera delivers exceptional autofocus performance. The X-T4 has the ability to focus fast and accurately in low light, lock onto human face / eyes, and track a moving subject with ease providing you with added confidence to capture the decisive shot.
The new AF algorithm on the X-T4 gives an AF speed of up to 0.02 second; which is the fastest AF speed among mirrorless cameras with an APS-C size sensor.
The improved AF algorithm also allows you to capture your subject with an outstanding accuracy of over 90%. This evolved AF algorithm combined with the X-Trans CMOS 4 and the X Processor 4, gives professional-level performance at every opportunity
The tracking AF performance has been significantly improved. The new algorithm uses colour information and the subject shape to lock on and steadily track a moving subject, maintaining accurate and instantaneous focus.
The Face / Eye AF performance has been updated and is now around twice as good at tracking people’s face and eye while shooting in burst mode. The X-T4 will capture the face and eye even when the subject is constantly moving across the entire frame.
©Jonas Dyhr Rask
The AF system in the X-T4 works down to -6.0EV, which is almost complete darkness. The phase-detection AF system is fast and accurate even in these low light conditions.
The new focal plane shutter unit in the X-T4 uses a high-speed coreless DC motor. This enables a super-fast 15fps continuous shooting in post view*1 and an 8fps continuous shooting with live view. The shutter is also 30% quieter and offers twice the durability of previous models with 300,000 shutter actuations*2. The blackout period when using the live view burst mode has been shortened up to 75msec, and the release time lag is quick as up to 0.035second, promising you with an instantaneous response. When shooting with electronic shutter, you can shoot up to an incredible 30fps. Combined with the evolved AF performance, the shutter system makes it possible to capture the every moment, even when your subject is moving.
*1 Fastest burst shooting at mechanical shutter among mirrorless cameras with an APS-C size sensor (February, 2020)
*2 According to Fujifilm internal testing.