TheLex

Great thoughts, but I think DJ msseis the point in a very significant way. EVF is the acronym for Electronic View Finder. This refers to a small "monitor-like" device that allows you to see what you would normally see on your camera's view screen (as in the "Live Mode" view) remotely. These are typically much smaller than an external monitor and are designed to mimic the function of the regular optical viewfinder of the camera.There has been much discussion on other sites (like CheesyCam) about the possibilities for these devices. Of particular interest is how they may allow for a greater flexibility in camera placement and unique shooting angles as the position of the camera is no longer limited by the need to place the camera where an operator can also still look at the built-in view screen or finder.What DJ is discussing are what are commonly known as lens loupes. While certainly not useful on their own for assisting with critical focusing, they are extremely useful for far-sighted individuals like myself in helping us see the tiny screen better as we make our adjustments. They also serve as a sort of makeshift EVF that is much easier to see when using a DSLR on certain kinds of shoulder rigs, mimicking the EVF found on higher-end dedicated video cameras. I am very fond of my HoodMan HoodLoupe using it whenever I shoot video with my T2i.