Capture clearer photos of the stars with the Sigma AF 14mm f/1.8 DG HSM Art Lens. It can be used with Canon cameras having an EF mount. The lens design involves 16 elements arranged in 11 groups, including 3 FLD, 4 SLD, and 4 aspherical elements that minimize color fringing as well as chromatic and spherical aberrations. Moreover, a super multi-layer coat is applied on the lens elements to reduce ghosting and lens flare. This lens has a nine-blade diaphragm that offers a rounded bokeh effect on images. The Hyper Sonic AF motor can bring an object into focus quickly and quietly. You may also use the manual-focus override for more precise focusing. The lens body is made of a thermally stable composite material for ensuring robustness in any weather condition.