Vivitar 285HV Professional Non-Dedicated FlashThe built-in variable power of the Vivitar 285HV auto professional flash provides you with fill flash and the ability to shoot properly exposed rapid-sequence pictures. This vertical bounce flash gives your photographs soft, professional lighting. The four f-stops give you control over the flash distance range and the depth of field, while the auto Thyristor circuitry allows for a faster recycling time as well as more flashes per set of batteries.