It has a similar size and design to the existing XF35 mm f/2.
The inner-focus AF system uses a stepping motor to drive lightweight focusing elements for silent and fast autofocus, says the company. When combined with the phase detection AF system of the X-Pro2 and X-T2, the lens can focus in 0.05 seconds.
The exterior is metal, and Fujifilm notes the aperture ring and focus ring have been designed with just the right amount of clicking and torque for optimum feedback and operability.
The lens is weather and dust resistant and operates at temperatures as low as -10°C / 14°F.
The lens features 10 elements in 6 groups with 2 aspherical elements; Super EBC (Super Electron Beam Coating) reducing both flare and ghosting; minimum working distance of less than 9 inches.
The Fujinon XF23 mm f/2 R WR will be available in September, initially in black only.