The Vivitar 285 is the world's most classic of all flashes. It's a fully automatic system flash for use with most cameras, digital, 35mm and medium format. The Vivitar 285 is not only the world's most popular flash of all time, it is also extremely modular: you can buy all sorts of crazy and sane accesory filters, zoom filters, light modifiers, cables, sensors and battery packs and more for it