Notes on use

In addition to this Help Guide, please read “Notes on use” in the Startup Guide (supplied).

While photographing

  • This flash unit generates strong light, so it should not be used directly in front of the eyes.
  • Do not fire more than 20 consecutive flashes (40 consecutive flashes when the flash power level is 1/32) to prevent heat build-up and degradation of this flash unit and its batteries.
    When the flash unit has fired the maximum number of flashes, stop using the flash unit and let it cool down for 20 minutes or longer.
  • During wireless photography, this flash unit may fire flashes unexpectedly because it is unable to receive communication signals from an off-camera flash for locational reasons. In such a case, change the location of the off-camera flash or the wireless channel setting.
  • Do not put this flash unit with the camera attached in a bag, etc. It may result in malfunctions of the flash unit or the camera.
  • Do not carry around this flash unit with the camera attached. It will result in malfunctions.
  • Keep the flashlamp away from a human body when tilting it up for bounce flash photography to prevent eye damage or skin burns.
  • When tilting up or down the flashlamp, keep your fingers off the tilt part to prevent injuries.
  • When closing the battery chamber door, hold it firmly down while sliding it fully across.
    While closing the battery chamber door, be careful not to injure your fingers by being caught by the door.


  • Depending on the storage temperature or conditions, the remaining battery power of the alkaline batteries may be detected lower than the actual one and the TEST button on this flash unit may flash in orange. If you keep using the flash unit for a while longer, it may correctly detect the remaining battery power.
  • When the rechargeable nickel-metal hydride batteries are running out of power, the performance of this flash unit drastically deteriorates. This may cause the flash unit to suddenly stop operating shortly or immediately after the TEST button starts flashing in orange.
  • Do not use lithium-ion batteries in this flash unit as they may prevent the flash unit from delivering full performance.
  • Depending on the time elapsed since manufacture of the batteries, the flash interval and the number of flashes may vary from the values shown in the Specifications table even when this flash unit has brand new batteries inside.
  • Before removing the batteries for replacement, make sure you turn off the power to this flash unit and let it cool down for a few minutes. Depending on the battery type, the batteries inside the flash unit may have built up heat. Take sufficient care when you remove the batteries.
  • Remove and store the batteries when you do not intend to use this flash unit for an extended period of time.


  • The flash unit should only be used within the temperature range of 0 °C to 40 °C (32 °F to 104 °F).
  • Do not expose the flash unit to extremely high temperatures (e.g. direct sunlight inside a vehicle) or high humidity.
  • To prevent condensation from forming inside this flash unit, put the flash unit in a sealed plastic bag when bringing it from a cold environment into a warm environment. Let it warm up to the ambient temperature before taking it out of the bag.
  • Battery capacity decreases at colder temperatures. When using this flash unit in a cold environment, keep in mind that you should use new batteries or replace the batteries, from time to time, with the spare batteries that are kept warm. In a cold environment, the TEST button on the flash unit may temporarily flashes in orange even when there is some power left in the batteries.
    Batteries regain some of their capacity when warmed to normal operating temperatures.

Places to avoid for use/storage

  • Extremely hot, cold or humid places
    In places such as in a car parked in the sun, this flash unit may become deformed and this may cause a malfunction.
  • Places subject to direct sunlight or near a heat source (for storage)
    This flash unit may become discolored or deformed, and this may cause a malfunction.
  • Places subject to significant vibration
  • Places near a strong magnetic field
  • Sandy or dusty places
    Be careful not to let sand or dust get into this flash unit. This may cause the flash unit to malfunction, and in some cases the malfunction cannot be repaired.


To avoid hazards, such as a fire or an electrical shock, observe the following.

  • Do not carry around or store this flash unit along with metal objects, such as coins and hairpins.

  • Do not attempt to disassemble this flash unit, or make an alteration or a short circuit on the flash unit.

  • Do not use this flash unit when it is wrapped.

    Heat build-up may cause deformation of the flash unit or a fire.

  • Do not use this flash unit in a place subject to explosive or combustible gas.

  • If use of this flash unit causes radio interference with other devices, stop using the wireless functions.

    Radio interference may cause malfunctions, resulting in incidents.

  • Place this flash unit on a stable place.

    Placing the flash unit on a wobbling table or a tilted surface may cause the flash unit to fall off, resulting in injuries.

  • Before attaching this flash unit to a camera, make sure that the flash unit is not powered.

    Attaching the powered flash unit to a camera may cause malfunctions or unexpected flashes, resulting in eye damage by strong light.


  • Remove this flash unit from the camera. Clean the flash unit with a dry soft cloth. If it has been in contact with sand, wiping will damage the surface, and it should therefore be cleaned gently using a blower. In the event of stubborn stains, gently wipe them off with a cloth lightly moistened with water or tepid water, and then wipe the flash unit with a dry soft cloth. Never use strong a solvent, such as paint thinner or benzine, as it damages the surface finish.
  • If fingerprints or particles are stuck to the flashlamp, we recommend that you wipe it clean with a soft cloth.