In combination with the RFS 2.2 transmitter, you can use the Siros 800 S monolight with extremely
fast shutter speeds. For example, with ambient light, even with the aperture wide open (selective
focus), the image can be underexposed correctly with up to 1/8000 s and Siros still lets you set
dominant and creative light effects.

All you need for this is the RFS 2.2 transmitter, which is available for Canon, Fujifilm, Nikon and Sony
cameras. In addition, “HS” must be activated on all Siros units. This modifies the flash curve and
guarantees, in combination with RFS 2.2, correct exposure with no limits on your choice of shutter
speed.

Please read the operating instructions for the RFS 2.2 transmitter to learn more about optimum
use of the “HS” function.

While working in “HS” mode you are only able to use flash power level 4 to 10 with Siros.