Canon T3i / 600D shown with Letus Hawk VF LCD View Finder
Letus created a Hawk VF (View Finder) for the 3:2 aspect DSLR LCD's like the T2i. It so happened to fit on the Canon 60D and fits pretty nicely on the Canon T3i as well. There's a base plate that is mounted to the bottom of the camera (still supports a tripod mount), and the Hawk VF View Finder is attached through a quick release system. It's a great semi-permanent way to attach a View Finder to the T3i without the use of sticky frames. For a closer look at how that all comes together, check out the video below.