The Canon BG-E2N Vertical Grip/Battery Holder adds
a vertical shutter release, and is compatible with up to two BP-511,
511A, 512, or 514 lithium-ion battery packs, or six AA batteries with
included BGM-E2 battery holder. The BG-E2N provides an additional
shutter release, main dial, AE lock/FE lock and AF point selection
controls for easier vertical shooting, as well as a 1/4-20 size tripod
mount thread.
The BG-E2N replaces and improves upon the orginal
Canon BG-E2 grip by adding water-resistant, and dirt-resistant seals
for greater durability and to match the water resistant capability of
the EOS 40D camera body. It is also compatible with the Canon EOS 20D
and 30D SLR.