TV mode stands for Time Value but is better known as
Shutter Priority Mode. In TV mode the user specifies a shutter speed, while the camera adjusts the aperture size to correctly expose the image. This mode is typically used to freeze high speed action with a fast shutter speed, or intentionally create some sense of movement and blur in an image, ie, by using a slow shutter speed.
See
Shutter Speed for more information.
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