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For over 50 years broncolor has refused to compromise on the quality of light. In this sense, Siros is a true broncolor product. The Siros S includes the ECTC technology you know from our high-end Scoro and Move power packs. ECTC controls the flash curve and guarantees flash durations from 1/19’000s (t0.5) and constant colour at all times. The enormous control range goes up to 9 f-stops, resulting in output as low as 2 joules which gives the photographer an unrestricted choice of aperture. And the lightning-quick charging time, 0.02 to 0.9s at 400 joules, means you never have to wait.