I recently bought a 50D and am using the BG I originally bought for my 20D on the new body. The early version still works perfectly and since I take a lot of vertical shots provides good balance and shutter release versatility to my heavier lenses. Also useful as a battery backup. In fact, as the 20D is now in its twilight years, the BG actuator works better then the 20D which is failing.... You can still strip the camera down tor reduce weight/size if you need to be less conspicuous....... good luck!