Metz 48 AF-1 Shoe Mount Flash for Nikon i-TTL Digital Cameras, Guide Number 157-158' GN 118F (48m) at ISO 100 and 50mm, GN 158F at 105MM Upgradeable via USB Tilt & Swivel Head Auto zoom head and wide angle reflector from 18mm to 105mm (35mm format) Manual flash mode with output from 1/128 to 1/1 power