The aperture ring of the XF 27mm F2.8 R WR has an easy-to-read scale. The user can see the set value at a glance without having to look through the viewfinder or at the camera display. A locking function allows the aperture ring to be locked in the "Auto" position to prevent accidental adjustment when taking pictures. The XF27mmF2.8 R WR is also suitable for use in bad weather and adverse conditions. Seven seals protect the inside of the lens from splash water and dust and ensure that it is ready for use in temperatures as low as minus 10 degrees Celsius.

The focal length of the XF27mmF2.8 R WR is almost identical to the diameter of the image circle required to fully cover the APS-C sensor (28.4 mm). This enables an ultra-flat lens with high image quality. The XF27mmF2.8 R WR is one of the smallest and lightest lenses in the XF series. It measures only 62 mm in diameter and is exceptionally handy with a length of just 23 mm. At around 84 grammes, it is also very light, making it the ideal choice for situations where compact equipment and little luggage are required.

Despite the flat design, the optical construction of the lens contains seven elements in five groups, including an aspherical lens to correct optical errors such as spherical aberrations and distortion. Due to this design, the XF27mmF2.8 R WR offers high resolution performance, even when the aperture is fully open. The XF 27mm F2.8 R WR has a powerful AF motor for fast and precise automatic focusing. The five elements of the front lens group effectively correct common aberrations when shooting close-up or distant subjects. The high image quality is therefore guaranteed over the entire focal range.