This Battery Grip for Canon 20D 30D 40D 50D makes photographing in a vertical position much easier and provides a better handling of your camera especially when you are using heavy lenses. The battery grip provides more energy for your camera than a normal storage battery would. The battery compartment holds either two lithium batteries (original or third-party manufacturer) or a battery magazine for six AA Alkaline batteries. 

Feature:

2-step Vertical shutter