Polaroid PL108AF Studio Auto Focus TTL Flash for Nikon - PL108-AF-N Fully Automatic Design Optimized For Today's Digital Lenses, Ultra Compact Design Autofocus Assist Lamp For Accurate Focusing Even In Low Light Situations, True TTL (Through The Lens) Operation For Seamless Flash Photography Internal Tilt / Bounce Feature Provides Precise Light Control Guide No. 24m At ISO-100, Fast 0.3 Second Recycling Time Auto Sleep Mode For More Shooting Time + Less Charging Time