Brand: Opteka Manufacturer: Opteka Model: OPT-50D-GRIP-KIT 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...