Interfit joins the wave of manufacturers producing studio-quality TTL flash heads with the introduction of the S1a 500Ws HSS TTL AC Powered Monolight.
The S1a has 3 shooting modes: Wireless TTL for Canon or Nikon, Manual Mode, and High-Speed Sync. Wireless requires purchase of a Nikon or Canon dedicated transmitter, but once that's done, you can basically treat these studio strobe units as you would your on-camera flash. In TTL, the camera's flash technology takes stock of the scene and automatically adjusts the power from 7.8 to 500Ws across a 7-stop range. If you want to fine tune your exposure, there's +/- 3 stops exposure compensation adjustable in 1/3 stops, and you can do it all at distances up to 328' thanks to the S1a's built in radio receiver.
Traditional manual mode is also available for those who want complete control. Manual mode is also how you access HSS (High-Speed Sync). This mode uses the flash's top 4 power levels (from 62.5 to 500Ws) to allow you to access sync speeds as short as 1/8,000. HSS presents a new world of exposure possibilities whether you're trying to overpower the sun, control the background's brightness or use wider apertures.
The S1a recycles to full power in 3 seconds and a fraction of that time at reduced power levels. Thanks to the incorporation of IGBT technology, the flash can also reach flash durations as short as 1/9000 sec. for the ultimate in stop-action while still maintaining a steady 5700K color temperature. The S1a includes a 7" Bowens S-Type reflector, AC power adapter and a mini USB cable for firmware upgrades.