Canon BG-E13 Battery Grip Brand_Visible Dust there is practically no fall-off

there is practically no fall-off at the edges - even at full aperture - in the MTF curves for image sharpness

Battery Pack for the selected PowerShot SX series

Incorporating a high-performance aspherical (AL) optical element and a super-low-dispersion glass optical element in its optics

Battery grip BG-E13 dedicated for the EOS 6D can accommodate two LP-E6 batteries for prolonged shooting time

Canon BG-E13 Battery Grip Brand_Visible Dust there is practically no fall-offBattery grip BG E13 dedicated for the EOS 6D can accommodate two LP E6 batteries for prolonged shooting time. It can also be used as a vertical grip, the grip handling is vastly improved by rearranging the orientation of the battery magazine compared to earlier models. The battery grip with dust and water resistant design ensures reliable performance even under tough outdoor environment.