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The Phottix BP-40D Premium Series Vertical Grip/Battery Holder for Canon EOS 20D, 30D, 40D and 50D digital cameras. This battery grip can hold two BP-511A or six AA size batteries to offer double-length shooting time. It is also equipped with a vertical-grip shutter button, dial, AE lock/FE lock button and AF point selection button to make shooting with the camera in a vertical position just as comfortable as shooting horizontally.