Canon
BG-E4
Battery Grip for EOS 5D mkI
The BG-E4 battery grip from Canon is designed for use with the EOS 5D mkI and improves the handling of the camera, as well as adding a vertical shutter button, main control dial, AE/FE lock button, AF point selector, and doubling your potential shooting time. The BG-E4, made with the same magnesium alloy construction as the 5D camera itself, holds up to 2 BP-511/511A/512/514 batteries. Alternatively, it can use 6 "AA" batteries (only in temperatures above 50°F/10°C). The vertical shutter release and main control dial help make shooting with the camera in a vertical position just as comfortable as shooting horizontally, and the BG-E4 adds a third strap eyelet to the camera so that you can use the optional E1 Hand Strap.