Monitor the camera on the tw is what the meaning of how to set up
T for telephoto, English Telephoto. In other words, the more the direction of the twist to W, the shorter the focal length of the lens, you can see a larger range, but things accounted for smaller.
On the contrary, the direction of the more twisted to the twist, the longer the focal length of the lens, you can see a smaller range, but things accounted for even greater.
You can zoom lens. W is wide angle, english wide Angle.
