Buy from Amazon.com : http://fave.co/1CH320j <br /><br />Sigma EF-530 DG ST Electronic Flash for Sony DSLR<br /><br />Product Description : <br />Powerful Guide Number of 174 ft 53m at 105mm Setting <br />Designed to work with the new TTL systems of all the popular manufacturers <br />Covers a focal length from 24mm to 105mm <br />Built-in Wide Angle Diffuser Panel allows the flash to cover an angle of 17mm
