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[Sean]

It is convenient for photographers to get a tripod. The tripod can fix their camera to get sharp picture. Both still and motion photography, the tripod can prevent camera movement. Especially, when we use the telephoto lenses with the shutter opening, any camera movement will cause in a fuzzy picture. At the same time, tripods can reduce the shake of camera in order to get the best image. A tripod is also useful in having a precise picture. What’s more, using a tripod allow for more thoughtful approach photography. For these reasons, it is necessary for a professional photographer as well as a video user to have one kind of tripod.
The construction of a tripod is braced around a center post, with collapsible telescoping legs and a telescoping section at the top. There is a head at the top of the tripod, which include the camera mount, some joints and a handle. The joints make the camera pan and tilt. And with the handle, users can operate easily without jostling the camera.
As for the screw thread, there are 1/4"-20tpi, 3/8"-16tpi, 1/4"-20UNC and 3/8"-16 UNC.
Also there are several types of tripod. Some tripod is with flexible legs. some comes with an attached head and rubber feet. Some is sturdier, stronger, and usually come with no integrated head. As long as you have a camera, you can find one kind of tripod perfectly fit your camera.