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A wide-angle lens enables you to get more into the frame of your image. At the same time it makes objects seem smaller and further away. A wide-angle lens has an obvious, practical value if you are trying to photograph a sweeping landscape or if you are taking pictures in confined spaces.

The term ‘wide-angle’ covers a range of focal lengths. On a 35mm film camera, a 35mm lens would be considered a modest wide-angle and a 28mm lens a ‘proper’ wide-angle. 20mm lenses are ‘super-wides’, and considerably more expensive.

The standard zooms supplied with modern cameras usually have a minimum focal length of 28mm, which is probably as wide as you will usually need to go.

Just as there are super-wide fixed focal length lenses, so there are wide-angle zooms, which cover similar focal lengths, such as 16-40mm on a 35mm camera, or a 10-20mm lens on a digital SLR. These lenses are bulkier and more expensive than standard zooms.