Fully support 1/8000s High-Speed Sync,Multi Flash, Delay Flash,Mask Function, S1/S2 Optic Triggering, C.Fn Custom Function, etc. As a high-speed studio flash, QTllIM has 0.01-0.9s extremely fast recycling time, 1/670-1/29600s ultra short flash duration(t0.1) and over 20 continuous flashes per s..