Interfit S1a HSS TTL 500w/s Monolight (AC Only)

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Interfit S1a HSS TTL 500w/s Monolight (AC Only)

Interfit SKU: INTS1A | Helix SKU: IFINTS1A

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 fromcamera 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.

    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

    10W LED


    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:

    • 1 - S1 Flash Head
    • 1 - 18cm (7") Reflector - with Bowens® S-Mount
    • 1 - Battery for Interfit S1
    • 1 - S1 Battery Charger
    • 1 - AC Power Pack for Interfit S1
    • 1 - Micro-USB Cable
    • 1 - Sync Cable