# Canon SLR
We know that the shutter priority exposure mode on SLR cameras is usually marked with S or TV, and Canon SLR cameras are TV.
TV file is a shutter priority automatic exposure file. After setting the shutter speed, the camera will automatically adjust the aperture value to obtain the correct exposure. The higher the shutter speed, the more dynamic images can be captured and less likely to be blurred.
shutter is a device that blocks and controls the length of time light enters in front of the camera lens . Nowadays, the shutter speed of many cameras is automatically controlled by the camera. The shutter speeds mainly include 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000, etc.
shutter priority mode, user-defined shutter value, the camera's internal metering system calculates a reasonable aperture size, suitable for shooting moving objects and night scenes.
For example, when shooting a waterfall, the effect taken in the fully automatic mode is very dull. At this time, you can use the shutter priority mode to lower the shutter a few steps to get a curtain-like effect; another example is the effect on the shooting field. Athletes, by customizing a high shutter value, can capture wonderful moments, and vice versa can produce a dynamic effect.
In the shutter priority mode of the SLR camera, you choose the shutter speed. You can choose the shutter speed arbitrarily among the shutter speeds allowed by the camera, and then the camera will choose the appropriate aperture for exposure based on this.
When shooting running water or fountains, use Tv mode. A shutter speed of about 1/50 can produce a satin effect. If you use a shutter that is too fast, the fountain will be shot with discontinuous water droplets.
