Sigma's earlier 14mm ultra-wide — f/2.8 with HSM motor and aspherical elements for full-frame.
The Sigma 14mm f/2.8 EX HSM Aspherical is an earlier ultra-wide prime providing 14mm on full-frame. Predating the 14mm f/1.8 Art and 14-24mm f/2.8 Art, it offered budget ultra-wide at 14mm with HSM motor.
Optically adequate — sharp in the centre from f/5.6 with the 14mm providing dramatic 114° ultra-wide coverage. Aspherical element helps control distortion. HSM motor. EX professional build quality. Bulbous front element.
Available for Canon EF and Nikon F mounts. Bulbous front — no filter thread. HSM motor. Approximately 560g. EX build. Full-frame coverage. Minimum focus distance approximately 18cm.
Available used very cheaply. The 14mm f/1.8 Art is dramatically better. The 14-24mm f/2.8 Art offers zoom versatility. This older version is only worth considering at very low prices. Check for smooth focus and clear optics.