Ordered this for my 7D after a night of trials and tribulations attempting to find focus using the naked LCD. You need an LCD viewfinder. This one attaches the mounting frame to the camera back with an adhesive. The view finder has magnets in the plastic frame. This means you do not need different frames if you use a battery grip and extended frames are not cheap. Also. it gets a little crowded around the tripod hole with other "necessary attachments". I loved this for my first day of shooting. The second day was hotter, about one hour in the adhesive let go and instead of the frame remaining attached to the viewfinder body, it hit the beach sticky side down of course. This made the rest of the day miserable and it got cut short. I've attached my second frame, but I have no doubt that the first incident will repeat itself at another critical time. I intend to keep experimenting with automotive/marine quality adhesives until I get one that works.