Samyang 20mm f/1.8 ED AS UMC Pentax K

The Samyang 20mm f/1.8 ED AS UMC is a high speed, manually focused wide-angle lens made to support full frame cameras from Canon, Nikon, Pentax and Sony. It is also available in mounts for various APS-C and Micro Four Thirds models. The large aperture, f/1.8, means the lens can be used to photograph in poor lighting conditions or to make a main subject stand out against a blurry background. The 20 cm minimum focusing also adds versatility to the lens. The optical construction consists of 13 elements in 12 groups. Two aspherical elements counteracts spherical aberraion and assure high sharpness across the image at all apertures. Three elements made from ED glass (Extra-low Dispersion) minimize the risk of chromatic aberrations and help the lens produce pleasing colors.   Features 20mm wide-angle lens with high speed aperture (f/1.8) Full frame compatible Manual focus with smooth focus ring 2 aspherical and 3 ED elements for maximum image quality Available in many mounts   Specifications Focal Length: 20 mmMaximum Aperture: 1.8Image Circle: 24 × 36 mm (full-frame). Will also fit APS-C / M4/3Lens Mount: Canon EF, Canon EF-M, Nikon F, Fujifilm X, Olympus / Panasonic Micro 4/3 (MFT), Pentax K, Sony A, Sony E, Samsung NXFocusing: ManualImage Stabilizer: No **Optical Construction: **13 elements / 12 groupsMinimum Aperture: 22Minimum Focus: 20 cmMaximum Magnification: UnknownDiaphragm Blades: 7Filter Size: 77 mmLength: 88 -- 115 mm depending on mount. Canon EF: 88 mm. Nikon: 86 mm. Sony E: 114 mm. Fujifilm X: 115 mm Diameter: 83 mmWeight: 488 -- 565 grams depending on mount. Canon EF: 497 g. Nikon: 488 g. Sony E: 525 g. Fujifilm X: 565 g **Included Accessories: **Lens hood, lens capsOther: --