On many cameras it is "TV" for Time Value.
Exposure, in digital or film photography, is determined by aperture and shutter speed. On a manual camera, the user selects both values.On an automatic camera, there are four possibilities:Manual mode. User selects both aperture and shutter speed.Shutter priority. User picks the shutter speed and the camera adjusts the aperture to ensure proper exposure.Aperture priority. User picks the aperture and the camera adjusts the shutter speed to ensure proper exposure.Program mode. The camera selects both values.
Shutter priority mode allows you to set the desired shutter speed while the camera adjusts the aperture, whereas aperture priority mode lets you choose the aperture setting while the camera adjusts the shutter speed.
It depends on what camera your using
There is no measurement for shutter lag, unfortunately, on digital cameras.
To use the shutter on a Nikon D90, first, set your camera to the desired shooting mode (e.g., Aperture Priority, Shutter Priority, or Manual). Compose your shot, then press the shutter release button halfway to focus; once focused, press it fully to take the picture. You can also adjust the shutter speed in Shutter Priority mode or Manual mode by rotating the command dial. Ensure your camera is steady to avoid blurriness, especially at slower shutter speeds.
Aperture Priority has the camera set the shutter speed for you allowing you to set the aperture and it will set what shutter speed it thinks is best for your current light situation.
Aperture priority lets you set the aperture you want and the camera sets the shutter speed for you. You use it when you want to control depth of field. Shutter priority lets you set the shutter speed you want and the camera sets the aperture for you. You use it when you want to control how motion is rendered in the photograph. Program mode sets both shutter speed and aperture for you. Use it when you are not concerned with aperture or shutter speed control.
To change the shutter speed on a Nikon D90, turn the mode dial to "S" for Shutter Priority mode. Then, use the command dial to adjust the shutter speed to your desired setting.
Shutter priority.
Question needs to be more specific. Brand and model of camera and operational mode that you are using.If the shutter speed is very high, chances are you are shooting in very bright light and the camera has some kind of inbuilt sensor which adjusts accordingly.
real fast . wide open shutter
I am not sure if you are asking about a digital camera or a old style camera. If you want a good older camera that would be a Cannon as you can set the shutter speed on it. If you are talking about a digital camera then you should hold the shutter button down longer.