The metz mecablitz 64 af 1 digital flash for nikon cameras is a powerful unit with a guide number of 210 at iso 100 and 200mm that works with nikon ittl this model is equipped with a metal shoe for durability the unit features an automatic zoom with a range between 24 200mm and comes with a built in wide angle diffuser that extends its reach to 12mm the 64 af 1 also has a secondary light reflector with two output levels for achieving even lighting as well as wireless functionality as either