With a guide number of 64 at iso 10021deg this is simply one of the most powerful hotshoe mounted flashguns on the market the 64 af 1 is a real workhorse and bound to be a hit with professional photographers its packed with features and built to last the design features a rotating colour display which is a cinch to operate a modelling lamp for finding your shot in particularly dull conditions or at night time events plenty of swivel and tilt for bounce work and a motorised zoom for 24