I bought this for my 550d, it`s a perfect fit and looks the part. As the title of my review says it`s a good quality item. The only downside to these viewfinders is that you have to stick a mounting plate to the rear of the camera, but i got around that by investing in a GGS III Glass LCD Screen Protector (from amazon) which mounts by attaching to the eyepiece viewfinder, i then fixed the loupe mount plate to the lcd screen protector, Bingo ! the whole unit is mounted via the eyepeice and nothing is glued to the camera body. The unit is easily demounted from the camera and leaves the glass screen protector in place so you can use the eyepeice.The loupe also has a flip up eyepeice so you can quickly revert to using the lcd screen,this also provides deep shade for the screen and makes it easier to see in bright light.The diopter adjuster is a focus ring on the eyepeice and is much better than the ones on my sony pro video cameras ! and has plenty of adjustment.
Because there are two glass elements (protector and mount plate,when used as discribed) there is a slight ghosting effect in bright light and some internal reflection is noticed, but its not too distracting. I`ve been using this for about a while now and I love it. At this price you really cant go wrong....Recommended !