The Flash X-Tender (Better Beamer) FX-4 Flash Output Booster for the Nikon SB-600 and SB-800 Flashes with Lenses 300mm<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Increases light output from your flash </span></li><li><span class="a-list-item"> Focuses flash with big telephoto lenses </span></li><li><span class="a-list-item"> Faster recycle times </span></li><li><span class="a-list-item"> Reduced battery consumption </span></li><li><span class="a-list-item"> Exposure handled automatically by TTL </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41ZicXd932L.jpg" noproxy>