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is the most powerful one yet, now offering a Guide number of 61 which translates into 61/m (200/ft)
designed to work with the latest TTL auto exposure systems of all the most popular digital and film SLR cameras
The auto zoom function automatically sets the optimum illumination angle in accordance with the lens’ focal length in a range from 24mm to 105mm
Sigma EF-610 DG ST Electronic Flash
