This Sigma EF610 DG ST Flash for Canon is a powerful (guide number of 61) shoe mount flash designed for use with Canon cameras. TTL automatic flash exposure control is available for all compatible cameras. An auto zoom function automatically sets the optimum illumination angle according to the focal length in use (from 24mm to 105mm), or with the built-in wide panel, 17mm.
The flash head can be tilted up and to the right by 90 degrees, to the left 180 degrees for flexibility in using bounce flash, or down by 7 degrees for close-up photography. There's also a manual flash mode, making it possible to set the flash power to full or 1/16 power. A confirmation light keeps you informed as to when the flash is fully recycled, and there's an Auto Power-Off function to help save battery power.
Type Shoe mount Guide No. 61 Angle of Coverage Automatically set in accordance with the focal length of the lens, in a range from 24mm to 105mm. Also covers the angle of a 17mm lens when used with the built-in Wide Panel Vari-Power Not specified by manufacturer TTL Dedication Yes, for Canon AF Bounce Head Bounce angle (Up) 0, 60, 75, 90 degrees
Bounce angle (Right) 0, 60, 75, 90 degrees
Bounce angle (Left) 0, 60, 75, 90, 120, 150, 180 degrees
Tilt angle (Down) 0, 7 degrees
Swivel Head Yes Zoom Head Yes Off Camera Terminal Not specified by manufacturer Recycle Time Approx 7 seconds (when using alkaline batteries)
Approx. 5 seconds (when using NiCd, Ni-MH batteries)
Power Source Four AA Alkaline or AA NiCd or Ni-MH (Nickel Metal Hybride) batteries Dimensions 3 x 5.5 x 4.6" (7.7 x 13.9 x 11.7 cm) Weight 11.3 oz (320g) without batteries