The Canon BG-E2N battery grip is an assett to any photographer's gear list. This grip will allow you to shoot vertically with your Canon EOS 20D, 30D, 40D, or 50D camera and offers a main dial, shutter release, AE lock/FE lock, AF point selection controls, and a 1/4-20 tripod mount. With the BG-E2N your battery life will be doubled, giving you a longer shooting capability, and increasing the efficiency of your camera. Canon even added water/dirt-resistant seals to match the water-resistant capabilities of the Canon EOS 40D. This piece is a must-have for photographers of all skill levels.