Telephoto lens series nikon af s nikon fx lens mount nikon f lens speed 14 focal length 85 mm suitable for sensor types aps c full frame construction prime lens area of use portrait photography night photography astrophotography action photography focus auto focus manual focus af motor ultrasonic motor usm closest focusing distance 85 cm lens construction groupselements 910 number of aperture blades 9 minimum aperture 16 max aperture 14