Interfit S1 AC & Battery-Powered HSS TTL Flash

SKU: INTS1 Categories: , , .

The world’s first ac- and battery-powered TTL/HSS monolight in one package. Color accurate with short flash duration.



Click HERE for the latest firmware updates for the S1

The S1 is the first high-tech TTL HSS monolight to include intelligent TTL and HSS technology in a battery-powered monolight with an included International Multi-Voltage AC Power adapter in one complete package.

  • Through The Lens Metering in TTL Mode uses the S1’s entire 9-stop power range (500W – 1.9Ws) and is automatically calculated in 1/10th stop increments, and allows for ± 3 stops of exposure compensation
  • Manual Mode utilizes the entire 9-stop power range, controllable in 1/10th stop increments
  • High-Speed Sync in Manual Mode at up to 1/8000th of a second shutter speed using the top 3 stops of the power range (10.0 – 8.0) and is manually adjustable in 1/10-stop increments
  • Included International Multi-Voltage AC Adapter that can power the unit with or without the battery in place, maximizing battery health longevity
  • Integrated and exchangeable lithium-ion battery is flush with the flash body, offers a 350 full power flash capacity and allows for wire-free and rapid setup and repositioning of lights when power outlets encumber workflow or are not an option at a shoot
  • Color Accurate to within ±100 Kelvin using high-tech insulated-gate bipolar transistor (IGBT) technology
  • Short Flash Duration for freezing action and sports motion between 1/500th of a second to 1/11000th without compromising color consistency, using IGBT technology.
  • Integrated Wireless System with remote TTL flash exposure compensation and manual power control in three groups from camera position using the S1 Remotes for Canon, Nikon, or Sony (sold separately)
  • Frosted Glass Dome softens and disperses light evenly through large and small light modifiers alike, from large octaboxes to small beauty dishes and reflectors while protecting the user-replaceable flash tube.
  • Aluminum Construction with an attractive matte finish gives the unit greater heat dispersion, durability and weight-to-rigidity efficiency
  • Firmware Upgradeable via Micro USB Port for future fixes and features
  • Bowens® S-Type Mount is compatible with a large scope of adapter rings and modifiers such as softboxes, reflectors, and grids

Additional information

Maximum Wattssecond


Power Range

9-Stops (500Ws – 1.9Ws)

Recycle Time Full Power

3 Seconds

Flash Duration

1/500 – 1/11,000 (max-min power)

Color Temperature

5700K +/- 100K

Fitting Type

Bowens® / S-Type

Modeling Lamp



Interfit TTL-C/N/S 2.4GHz Remote, Sync Port, IR/Optical

Shooting Modes

Manual, TTL (Canon/Nikon/Sony), HSS

Maximum Flash Sync Speed

1/250sec. in normal sync mode, 1/8000sec. in high speed sync mode

Operating Voltage

100-240V AC

Battery Type

4500mAh Li-Ion

Battery Life

350 full power flashes

Battery Recharge Time

3 Hours

Fan Cooling


Auto Power Dump


Flash Ready Indicator

LED and switchable audible


34 x 23 x 13cm (13.4 x 9.1 x 5.1")


2.85kg (6.3lb)

The Interfit S1 AC & Battery-Powered HSS TTL Flash includes:

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