Photokina 2010: Sigma's second flash of the day is the EF-610 DG ST. Designed to work with the latest TTL autoexposure systems of all popular digital SLR systems, it has a maximum guide number of 61m (ISO 100, 105mm setting) and a bounce and swivel head. There's also basic manual control available, with a choice between full and 1/16th power output.

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Sigma Electronic Flash EF-610 DG ST

Powerful, fully automatic flashgun for easy operation

  • Powerful light output with a Guide number of 61
  • Designed to work with all popular SLR cameras
  • Illumination covers a focal length from 17mm to 105mm
  • Fully automatic flash photography for easy operation
  • Tilt and swivel head for bounce flash photography

The Sigma Corporation is pleased to announce the launch of the new ELECTRONIC FLASH EF-610 DG ST.

The EF-610 DG ST features a powerful Guide Number of 61 and is designed to work with the latest TTL auto exposure systems of all popular digital and film SLR cameras. It features TTL automatic flash exposure control for easy operation.

The autozoom function automatically sets the optimum illumination angle in accordance with the lens' focal length in a range from 24mm to 105mm. When the built-in Wide Panel is used, the flash can cover the angle of 17mm. For bounce flash, the flashgun head can be tilted up by 90 degrees, to the left by 180 degrees, or to the right by 90 degrees. It can also be tilted down by 7 degrees allowing ease of use for close-up photography.

In addition to automatic mode, the flashgun also features a manual flash mode, making it possible to set the flash power to full or 1/16. When the flashgun is fully charged, a confirmation 'ready' light will be emitted and the flash exposure level can be checked through the camera’s viewfinder. Other features incorporated into this flashgun include the Auto Power-Off function to help save battery power.

Sigma Electronic Flash EF-610 DG ST specifications

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24mm
28mm
35mm
50mm
70mm
85mm
105mm
G.N.(m)
34
35
36
46
52
56
61
G.N.(ft)
112
115
118
151
171
184
200

Price • US: $TBA
• UK: £TBA
Power Source • Four AA batteries
• Alkaline , NiCd or Ni-MH (Nikel Metal Hybride) may be used
Charging time • Approx 6 seconds (with alkaline batteries)
• Approx 4 seconds (with NiCd, Ni-MH batteries)
Number of flashes • Approx.220 flashes (with alkaline batteries)
• Approx.100 flashes (with Nicd, Ni-MH batteries)
Illumination angle • 24-105mm
• 17mm with built-in wide panel
• Automatically set in accordance with the focal length of the lens
Bounce angle (Up,Right) • Up: 90 degrees
• Down: 7 degrees
• Left: 180 degrees
• Right: 90 degrees
Dimensions 77×139×117mm (3.0 x 5.5 x 4.6 inch)
Weight (without batteries) 315g (11.1oz.)