Excerpt: I personally shoot in vertical/portrait orientation as much as in horizontal/landscape orientation. Having the vertical grip allows me to shoot from a much more comfortable and much more stable position - and gives me more control over larger lenses. The BG-E2N is invaluable for long sessions of vertical use.
Excerpt: The Canon BG-E2 Battery Grip adds the Canon EOS 30D and EOS 20D 's missing part of the hand grip. It gives the pinky a home. It gives you more control over your larger lenses. It gives you a vertical/portrait grip with its associated controls and shutter release. And it gives you room for two Canon BP-511/511A/512/514 Lithium-ion battery packs .