Sigma 14-24mm f2.8 DG HSM ART - Canon EF Lens Mount_Pentax K The inclusion of 4 aspherical

The inclusion of 4 aspherical lenses that helps achieving the downsizing of lens unit also improves optical performance by minimizing distortion

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It can also be used as a vertical grip

Sigma 14-24mm f2.8 DG HSM ART - Canon EF Lens Mount_Pentax K The inclusion of 4 asphericalThe Sigma 14 24mm F2. 8 DG HSM Art is the ideal ultra wide angle zoom lens for the most demanding photographers. With a constant F2. 8 aperture throughout the entire zoom range, its designed for 50 megapixel plus cameras for outstanding high resolution image quality. An updated Hyper Sonic Motor (HSM) provides fast and accurate autofocus. 3 FLD and 3 SLD glass elements; 3 aspherical lens elements; and 1 large diameter aspherical element minimize