Sigma EF-610 DG ST

Sigma is better known for its range of lenses, but it also produces a decent line in flashguns too, with the EF-610 DG ST available for Sigma, Canon, Nikon, Pentax and Sony systems. It’s a large flashgun, tipping the scales at 320g, and has the look and feel of a durable piece of kit.

Sigma EF-610 DG ST

Sigma EF-610 DG ST

It has a bounce and swivel head, but two separate buttons operate these, which can be a little annoying. The built-on wide-angle diffuser and reflecting plate are great additions, and the minimal controls on the back make this an intuitive model to use. Out of the box, you also get a hotshoe stand and a protective bag.

As with all models in the test this flashgun has plastic feet, which isn’t a problem in terms of operation, but after putting on and removing your flashgun over a long period of time these will wear and could cause issues.

With both TTL and manual features, you have the ability, via your camera, to have more control over the flash output. There is a zoom range of 24-105mm, which automatically sets the optimum illumination angle in accordance with the lens’ focal length, and a manufacturer stated guide number of 61 – the longest produced by Sigma to date. We clocked the guide number at 45, a good deal less than 61 but an indication nevertheless of the powerful output of this flashgun. A good flashgun for a wedding photographer.


  • Street price: £89
  • Listed guide number 61
  • Tested guide number 45
  • Listed recycle time 5secs
  • Tested recycle time (NiMH @ full power) 4.8secs
  • Tested recycle time (Alkaline @ full power) 6.3secs
  • Flashes per charge (NiMH @ full power) 180
  • Flashes per charge (Alkaline @ full power) 133
  • Focal length coverage 24-105mm
  • Wireless optical slave Yes
  • AF assist beam Yes
  • Fill-in reflector Yes
  • Wide-angle diffuser panel Yes
  • Power controls 1/1 or 1/16
  • Available to fit Sigma, Nikon, Canon, Sony, Pentax
  • Bounce angles 0, 60, 75, 90 degrees
  • Rotate angles (right) 0, 60, 75, 90 degrees
  • Rotate angles (left) 0, 60, 75, 90, 120, 150, 180
  • Dimensions 77x139x117mm
  • Weight 320g
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This review was first published in the Spring 2012 issue of Practical Photography - download back issues here.