Buy on Amazon : http://www.amazon.com/gp/product/B000SLNNG4?tag=catfoodrevi0a-20 <br /> <br />The Flash X-Tender (Better Beamer) FX-3 Flash Output Booster for Canon 580EX Canon 580 II and <br /> <br />Increases light output from your flash <br />Focuses flash with big telephoto lenses <br />Faster recycle times <br />Reduced battery consumption <br />Exposure handled automatically by TTL
