Laowa 12mm F2.8 Zero-D Lens (PENTAX). Ultra wide angle, manual focus lens with close to zero distortion. Superior optics provide crystal sharp images. Full frame compatible lens featuring 16 elements in 10 groups with a 7 blade aperture* and a minimum focus distance of just 18cms. All metal alloy construction housing multi-coated glass elements throughout. At a focal length of 12mm this lens is perfect for a wide range of subjects from astro photography to landscapes to architecture. Suitable for various mounts including Pentax K. Accepts filters with additional filter adapter.