New answers tagged canon-5d-mark-ii
This is a very common issue with the 5D series. You have accidentally locked the rear control-dial. The power-switch next to it has actually 3 positions. When lined up with On, the camera is on but the rear control-dial is disabled. When lined up with the white line which goes to that dial, the camera is on and the dial is enabled.
Top 50 recent answers are included