Compatible with select Canon DSLR cameras with an APS-C-size sensor For use with your existing camera. HSM (Hyper Sonic Motor) Enables fast, accurate autofocus with minimal noise. The rear focus system limits focus-dependent variation in aberration to ensure high-quality results. TSC (Thermally Stable Composite) materials Help prevent contraction and expansion of the internal lens barrel for optimal stability. Super multilayer coating Minimizes flare and ghosting for stunning clarity. SIGMA Optimization Pro software Enables USB docking for easy firmware updates and parameter adjustments (dock required, not included). 30mm focal length (35mm equivalent 45mm) Accommodates a wide range of needs, including art, travel, portrait, specialty and wedding and event photography. 50.7° angle of view Duplicates the range of human vision for flexibility. 1:6.8 maximum magnification Helps you capture vivid details. f/16 minimum aperture and f/1.4 maximum aperture For optimal light gathering, resulting in clear images, even in low light. 9 elements in 8 groups with 9 rounded diaphragm blades Create striking bokeh for arresting shots.