Traditional Culture Encyclopedia - Photography major - What does SLR camera 18- 135mm lens mean?

What does SLR camera 18- 135mm lens mean?

18- 135mm lens means that the focal length of this lens is continuously variable from 18mm (viewing angle of 74 degrees for 20 minutes) to 135mm (viewing angle of 1 1 degree for 30 minutes), and the camera uses a zoom lens. Under the condition that the shooting distance is unchanged,