- Ultra-wide-angle prime is designed for full-frame Canon EF-mount cameras but can also be used with APS-C models where it provides a 22.4mm-equivalent focal length.
- Complex 14 elements, 10 groups optical design includes one aspherical element, one hybrid aspherical element, two extra-low dispersion elements, and three high refractive index elements, which all combine to reduce spherical and chromatic aberrations and colour fringing, as well as improve sharpness, clarity, and colour accuracy.
- Ultra Multi-Coating has been applied to individual elements to minimize ghosting and flare for increased contrast and colour neutrality when working in strong lighting conditions.
- Manual focus design permits working with subjects as close as 11" away and an internal focusing design maintains the overall lens length during operation.
- The Built-in petal-shaped lens hood blocks stray light from reaching the front element and also offers some physical protection against light impacts.
- Weather-sealed design suits working in inclement weather conditions.
- Focus lock ring permits fixing the focusing position to prevent accidental changes, which benefits astrophotography and other long-exposure, interval-based, or other long-term stationary forms of shooting.
- The aperture ring de-click function allows the aperture ring not to be stopped at every f-stop in the way cine lenses do. This selectable function will allow brightness to be adjusted continuously and smoothly with much more detail between stops.
