Rokinon 14mm f/2.8 Series II Lens. Is an ultra-wide-angle prime that is especially well-suited to astrophotography, architecture, and landscape shooting applications. Featuring a 14 elements, 10 groups optical design, this lens utilizes a series of aspherical, low dispersion, and high refractive index elements to reduce color fringing, aberrations, and distortions for sharp, clear, and color accurate imagery. An Ultra Multi-Coating is also featured, as well as a built-in petal-shaped lens hood, to suppress lens flare and ghosting for improved contrast when working in bright, direct lighting conditions. Complementing the imaging assets, manual focus operation, with an internal focusing design, is employed that permits working with subjects as close as 11 away, and the metal housing is weather-sealed to permit working in inclement conditions. Additionally, a focus lock ring permits securing the focusing position to prevent accidental changes and the aperture ring can also be de-clicked to better suit video applications. Optically constructed of 14 elements in 10 groups (1 Asperical, 1 Hybrid Asperical, 2 ED, 3 High Refractive). Aperture range of F2.8 – F22. Built-in lens hood and a soft lens pouch is included. Features ultra multi-coated glass and 9 aperture blades. Angle of view of 115.7 degrees on full frame and 89.9 degrees on APS-C.