The samyang 35mm f14 as umc with pentax fit is a bright wide angle lens perfect for portraits travel and reportage photography this lens is specifically designed for cameras with a cropped aps c sensor and provides an approximate focal length of 50mm equivalent to 35mm format umc stands for ultra multi coated which indicates that the lens has been covered with multi layered anti reflective coating which minimises reflections and increases image contrast the samyang 35mm f14 has been