This Nikon Nikkor F/1.8 Wide Angle Fixed/Prime lens has 20 mm focal length. The AS, ED, N, RF, SWM lens features Auto & Manual Focus and is designed to be used with Digital SLR bodies. It weighs 0.79 lbs. Furthermore, the quick, near-silent autofocus, superior sharpness and color correction, make this lens ideal for every photographer who wants to capture any moment, making it memorable and special.