Just some images comparing the latest DSLR View finder. - This is the Carry Speed VFinder next to the much more expesive LCDVF. The VFinder is a bit larger the LCDVF, but also has a much more comfortable Eye Cup. Neither loupes have a diopter feature and are mounted to the camera via metal sticky frame and magnets on the loupe. Both versions are available for 4:3 and 3:2 LCD screens from Canon T2i to Canon 7D. Of course the new VFinder is much much cheaper..