Features:

• Battery grip adds a vertical shutter release to the Canon EOS 5D camera
• Compatible with up to two BP-511A battery packs or six AA batteries
• Increases shooting capacity and convenience when traveling
• Features an AE/FE lock button, AF point selector, and more
• Comfortable to use when the camera is held vertically

Editor Reviews:

Product Description:
The BG-E4 is a new battery grip designed especially for the EOS 5D. Constructed with the same magnesium alloy as the camera's exterior, it has a solid and comfortable hold. The grip can accommodate two BP-511A/514/512/511 battery packs or six AA batteries . The Battery Grip BG-E4 features a shutter release button, AE/FE lock button, AF point selector and main dial to enable comfortable use of the camera when held vertically.

Amazon.com Product Description:
The Canon BG-E4 Battery Grip for the EOS 5D Digital SLR Camera adds a vertical shutter release to an already robust camera. This grip is compatible with up to two of Canon's BP-511A battery packs or, alternatively, a set of six AA-size batteries, for increased shooting capacity and greater convenience when traveling. In addition, it features an AE/FE lock button, AF point selector, and a main dial to enable comfortable use of the camera when held vertically.

Rating : - Canon BG-E4 Battery grip for EOS 5D Digital SLR Camera
Ergonomically its superb for vertically composed shooting. Feels solid and sturdy. For travel in remote areas where power outlets are scarce the 6 AA battery option addresses that issue, this is the main reason I purchased the grip. As far as ruggedness goes, I'm taking it back to Alaska this summer and down to Nicaragua so I'll update this post after I return. The camera feels significantly more sturdy and "balanced" with the grip attached when used with the 24-70mm f2.8L and 70-200mm F2.8. For situations where discretion is required, the extra size can be initimidating for you potential subjects. The price seems a little steep.