The Sigma 35mm f/1.4 DG HSM A1 for Pentax is an extremely well-built 35mm prime lens for full-frame Pentax K-mount cameras. Key features include:

Fast-Aperture Prime. It offers a fast f/1.4 aperture, which is ideal for low lighting conditions, narrow depth of field, and ample background separation for portraiture. A Hyper Sonic Motor system gives fast and accurate autofocus performance on either full-frame or crop-frame cameras.

Optics. A floating element maximizes close-focus performance, and the front of the barrel remains stationary regardless of focus distance. Aspheric and low-dispersion elements minimize chromatic aberrations, distortion, and vignetting.

Build. The 35mm A1’s build quality offers a substantial improvement over previous Sigma lenses.

Dock Compatible. As part of Sigma’s Global Vision series, this lens is compatible with the Sigma USB Dock for Pentax K Lenses (separate rental item), allowing you to adjust certain parameters through the Sigma Optimization Pro software.