Canon Camera Lens Rotating
There are many important pieces of information that you will find written onto the body of your camera lens. The first is the name of the lens itself, such as Canon EF-S 18-55 mm f/3.5-5.6 IS II SLR.
if you have a zoom lens, the largest adjustable cylinder on the lens' body will allow you to adjust the focal length. You will see a range of focal lengths listed, often from widest to narrowest, on the cylinder itself. Rotating the cylinder all the way in one direction will give you your widest focal length (such as 18 mm), while rotating the cylinder all the way in the other direction will give you your narrowest focal length (such as 55 mm). Whether this rotation is clockwise or counterclockwise depends on the manufacturer of your lens. If you look down at your camera lens while rotating, you will see some sort of mark (white line on Canon lenses) that points to which focal length you have currently selected.