Sigma EM-140 DG Macro Ring Flash for Canon SLR Cameras<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"> Fully dedicated with the latest TTL auto exposure systems </span></li><li><span class="a-list-item"> Flash tubes can be switched on or off for creative flash control </span></li><li><span class="a-list-item"> Wireless flash control; high-speed synchro flash </span></li><li><span class="a-list-item"> Guide number of 14 </span></li><li><span class="a-list-item"> Ideal for close-up photography， especially medical and scientific applications.55mm and 62mm adapter rings are included with the flash </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41IVzAUbG1L.jpg" noproxy>