The Interfit S1 is an affordable 500Ws, AC/DC powered monolight with high speed sync and TTL for Canon and Nikon cameras. The head is powered by a high-capacity 4500mAh Li-Ion battery which provides up to 350 full power flashes in Manual and TTL modes and over 400 full power flashes in high speed sync (HSS) mode. Firmware updates now available here http://interfitphotographic.com/s1-firmware-updates/.

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