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As it said it would at the beginning of October, Fujifilm has released a firmware update for its XT3 camera that it claims will dramatically improve autofocus performance.
Firmware version 4.00 for the XT-3 claims to triple the autofocus speed from 0.06 seconds down to 0.02 seconds, bringing it in line with the autofocus speed of the newer X-T4. The algorithm that predicts the location of subjects has also been improved, according tot he changelog.
Overall autofocus tracking performance has been doubled (compared to firmware version 3.30), with faster and more accurate subject acquisition. Both Eye AF and Face Tracking have also been given a performance boost with this firmware, doubling the tracking speed according to Fujifilm.
As noted in its initial announcement, this firmware also allows for autofocus performance down to -7 EV when using the new Fujifilm XF 50mm F1 and adds a focus limited option for pre-determining specific focus ranges.
Although much less exciting, the Fujifilm X-H1 has also received a firmware update (version 2.11) that addresses minor bugs.