The samyang 300mm f63 reflex ed umc cs is a compact manual focus lens dedicated for digital slrs with a sony a mount the optical structure contains 9 elements arranged in 6 groups including one ed type lens ensuring high contrast and effectively preventing chromatic aberration weighing only 318g and measuring 737 x 645mm in size the samyang 300mm is the perfect travel companion offering a lot of reach this prime telephoto lens is ideal for both city and nature photography