Canon EF 20mm f/2.8 USM Wide-Angle Fixed Lens<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="" 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"> Focal length and maximum aperture: 20mm 1:2.8 </span></li><li><span class="a-list-item"> Lens construction: 11 elements in 9 groups </span></li><li><span class="a-list-item"> Diagonal angle of view: 94 Degree </span></li><li><span class="a-list-item"> Rear focusing system with USM focus adjustment </span></li><li><span class="a-list-item"> Closest focusing distance: 0.20m/0.66 ft. </span></li><li><span class="a-list-item"> EF mount; wide-angle lens </span></li><li><span class="a-list-item"> Floating system; inner focusing; full-time manual focus </span></li></ul><!--   Loading EDP related metadata  --><div aria-live="polite" class="a-row a-expander-container a-expander-inline-container"><div aria-expanded="false" class="a-expander-content a-expander-extend-content" style="display: none;"><ul class="a-unordered-list a-vertical a-spacing-none"><li><span class="a-list-item">20mm focal length</span></li><li><span class="a-list-item">f/2.8 maximum aperture</span></li><li><span class="a-list-item">Ring-type UltraSonic Motor (USM)</span></li><li><span class="a-list-item">Lens not Zoomable</span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51ocfk6hrCL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51Kd%2BguMV3L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/518kMQoTEkL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/515L5gn4wRL.jpg" noproxy></div></div>