This category lists all DSLR Battery Grips for Nikon and Canon cameras. A battery grip allows you to run the camera on two batteries at once which lengthens the working time available before you need to change batteries, often allowing you to complete an entire day's shoot on one charge. Another advantage is that you can more comfortably shoot with the camera in portrait orientation as the DSLR battery grip provides a duplication of all controls (shutter button, exposureEXPOSUREExposure is controlled by three elements: Aperture, Shutter Speed and ISO. Achieving the correct exposure is similar to collecting rain in a bucket, up to an optimum level. The rate of rainfall is out of your control (light), yet you can control these three factors: the bucket’s width (lens aperture), the duration you leave it in the rain (shutter speed), and how effective your bucket is in collecting rain (ISO). These three elements work together to control the amount of light per unit area, preventing underexposure (too dark) or overexposure (too bright), giving you a natural looking image. control dials and exposure lock functions).