The Canon BG-E4 battery grip is the perfect accessory for any EOS 5D owner. The grip allows for easier use while the camera is in a vertical position, and even has a vertical shutter button. Other features include a main control dial, AE/FE lock, as well as an AF point selector.The grip will double the shooting time of your Canon 5D which will in turn provide you with all of the power you need to get through the day. With a magnesium alloy construction - just like the Canon 5D - your grip will look stylish while remianing durable and tough. The grip has the capacity to hold either two BP-511/BP-511A/BP-512/BP-514 batteries OR six AA batteries. Add this battery grip to your tools today and see how far you can go with your newfound extended battery life!