A battery grip is an accessory for an SLR/DSLR (and occasionally other cameras), which allows the camera to hold multiple batteries to extend the battery life of the camera, and adds a vertical grip with an extra shutter release (and other controls), facilitating the shooting of portrait photography.
It usually attaches to the camera body through the camera's own battery compartment and provides a cassette to hold additional batteries to increase the battery life for the camera. Most battery grips also come with a second cassette allowing the photographer to shoot using multiple AA batteries.
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Origins
Although it is not known who invented the helpful battery grip, the battery grip came from different sets of companies. Popular companies like Canon, Nikon . Leidolf and Leica being two of the oldest camera manufacturers, only having one battery grip available compared to the hundreds of battery grips made for the other camera companies.
Battery grips are usually designed to fit only one or a few specific camera models, since they must match the body's shape, connectors, and power requirements.
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Good uses
Extend the battery life; it holds extra batteries and provide a bigger battery for most cameras if the function is available.
Vertical grip; the battery grips gives the camera a more square shape that no matter what side the camera is turned, there is enough grip to hold it vertically.
Easier to hold smaller cameras for people with bigger hands Some cameras are small that photographers who have larger hands have a harder time holding the camera. The grip gives the camera more surface area for the photographer to hold onto.
Another shutter release button when held portrait; when turned vertically, depending on the battery grip there is a shutter release button so that it mimics the shutter release button when holding the camera horizontally.
Considerations
Before buying something, everyone has the question of "What do I have to look at?";
Brand name doesn't matter.
There are different types of battery grips for different types of cameras, so make sure the battery grip fits your camera.
A battery grip is not necessary for photography.
Companies
Depending on what camera the battery grip is for, there are companies that make battery grips, including:
Source of the article : Wikipedia
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