Fujifilm has announced the Fujinon XF50mm f1.0 R WR mid-telephoto prime lens, the ‘world’s first’ autofocus lens with a maximum aperture of F1.0 designed for mirrorless cameras. It will be available from late September, with an RRP of $2,799. 
The 35th X series lens features a DC autofocus motor, providing quick and accurate autofocus. The lens consists of 12 elements in nine roups, including one aspherical elements and two ED elements to control spherical aberration. The rounded diaphragm assists with achieving extremely shallow depth of field.
Fujifilm says the wide aperture allows the lens to perform in low light conditions, allowing the camera to operate with fast shutter speeds and lower ISO settings.
‘This makes it possible for the autofocus to operate at -7EV luminance level. The previous limit of -6EV luminance level is achieved using lenses with a maximum aperture of F1.4. X Series users now have fast and precise low-light autofocus, even when used in near-darkness. With the added benefits of on-sensor Phase Detection Autofocus (PDAF), Face/ Eye AF and a powerful DC motor, precise and fast autofocus at shallow depths of field is now a possibility.’
Fujifilm claims the focus ring, with 120 degrees of rotation, is ‘eight times more accurate’ than previous XF lenses.
The lens weighs 845 grams, and includes weather sealing in 11 locations to protect it from moisture and dust. It can operate in temperatures as low as -10°C.
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