Sunpak PZ5000AF Flash For Nikon Onboard processor features touch selectable controls for TTL, Auto Sensor, Power Ratio, Manual, 2nd Curtain Synch, Multi-flash (strobo) and Slave function Guide no. - 99 feet at 28 mm, 139 feet at 50mm, 165 feet at 85mm and 180 feet at 135m Selector Pad permits easy scrolling though various functions and operating modes Motor driven zoom head adjusts to match the focal length of lens in use from 28mm to 135mm. Manual override control Flash head swivels and tilts for creative lighting control