The AF 135mm F1.8 E telephoto lens is optimized for portraits, astrophotography, landscapes and video shooting. It includes Rokinon's key features, such as: focus lock button, switch, and focus range limiter switch. With Rokinon's announcement of the AF 135mm F1.8 E, its Auto Focus F1.8 E series now includes: 24mm, 35mm, 45mm, 75mm and 135mm focal lengths, completing the lineup from wide-angle to telephoto. Designed for portraiture, landscapes, and astrophotography, the AF 135mm f/1.8 FE from Rokinon is a medium-length telephoto prime designed for full-frame Sony E-mount mirrorless cameras. Offering outstanding resolution, the optical design incorporates three extra-low dispersion elements and an ultra-precision aspherical element, which suppresses both chromatic and spherical aberrations for improved sharpness, color accuracy, and clarity. An ultra multicoating has also been applied to reduce ghosting and flare to achieve higher contrast when working in strong lighting conditions. The lens has a linear STM autofocus motor for quick, quiet, and precise focusing performance, plus a minimum focusing distance of just 2.3 to suit working with close-up subjects. Three different buttons for enhanced functionality include a focus hold button, a switch, and a focus range limiter switch. FeaturesE-Mount Lens/Full-Frame FormatAperture Range f/1.8 to 22Three Extra-Low Dispersion ElementsUltra-Precision Aspherical ElementLinear STM AF MotorSpecificationsFocal Length: 135 mmMaximum Aperture: f/1.8Lens Mount: Sony ELens Format Coverage: Full-FrameFocus Type: AutofocusImage Stabilization: NoFilter Size: 82 mm Front Minimum Aperture: f/22Angle of View: 18.9°Minimum Focus Distance: 27.2" / 69 cmMaximum Magnification: 0.24xOptical Design: 13 Elements in 11 GroupsDiaphragm Blades: 11Dimensions: 3.7 x 5.1" / 93 x 130 mmWeight: 1 lbs