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The Sigma EF 610 DG ST Flashgun - Canon fit flashgun features a powerful guide number of 61 and TTL automatic flash exposure control for easy operation. The auto-zoom 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 ... More