Opteka Battery Pack Grip with 2 BP-511 for Canon EOS 20D, 30D, 40D & 50D Digital SLR Cameras Opteka Battery Pack Grip / Vertical Shutter Release for Canon EOS 20D, 30D, 40D & 50D Digital SLR Cameras with 2 BP-511 Batteries. Opteka is proud to be allowed to use the same factory and mold as Canon uses for their BG-E2N. Opteka is one of the world's leading producer of high-performance batteries and accessories. Opteka believes there is no limit to the potential of portable power - and as a company they will always ...

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