Lens The cylinder-shaped part on the front of the camera through which light enters, so you can see the picture you want to take on the viewfinder and which strikes the camera sensor to record the picture digitally.

Lens Depth-of-Field Scale

Lens Depth-of-Field Scale This is another scale on a lens. It consists of a series of lines, one for each of the f-stops of your lens, and two marks of equal distance to the right and left of each f-stop.

Lens Flare

Lens Flare This is an unwanted reflection of light that you may see in the viewfinder or not until you view your picture. A lens hood will help you reduce or eliminate lens flare.

Lens Focal length

Lens Focal length This is expressed in millimeters and represents the field of view of a camera lens. It is the distance between the focal plane and the rear nodal point of the lens, at infinity focus. For example, a 50mm lens has a wider view than a 100mm lens.