Complementing the optics, the lens's design also incorporates an STM stepping motor that affords fast, near-silent, and accurate autofocus performance along with full-time manual focus override. An internal focusing design also contributes to quick performance. Additionally, the lens features an integrated micro-USB port for making future firmware updates to the lens.
- A prime normal-length lens designed for full-frame format. When used on APS-C cameras, it has the equivalent perspective of a 75mm lens.
- Bright f/1.8 maximum aperture suits working in low-light conditions and also affords greater control over depth of field.
- 11 elements in 10 groups
- One extra-low dispersion element and two high transparency elements reduce colour fringing and chromatic aberrations in order to achieve a high degree of clarity and colour accuracy.
- Two aspheric elements help to control spherical aberrations and reduce distortion in order to realize high sharpness and accurate rendering.
- HD Nano multilayer coating has been applied to individual elements to suppress flare and ghosting for greater contrast and colour fidelity when working in strong lighting conditions.
- STM stepping motor enables quick, quiet, and precise autofocus performance along with full-time manual focus override. The internal focusing design maintains the overall lens length during use for improved handling and quicker response.
- Integrated manual aperture ring for tactile exposure control; this ring also features an 'A' position for automated, camera-based aperture selection.
- Integrated micro-USB port for firmware updates.