Canon HF-DC1 High Power Flash for Canon Powershot Digital Cameras Increase flash range up to 30 feet Go handheld or use mounting bracket for attachment to camera, light stand, or tripod Linked to camera's zoom lens, narrows flash angle at telephoto end Guide number of 18, ISO 100 meters For use with Canon G6/G5/S70/S60/SD500/SD400/SD300/SD200/SD20/A95/A520/A510/A400/Pro 1/S1 IS