Zoom lenses are those which have a variable focal length. These are lenses which are generally considered to be very versatile because of this ability. Zoom lenses are more complicated than their prime brethren and are generally less refined and less in optical quality because of more moving parts inside them. Zoom lenses also tend to be heavier for that reason. Zoom lenses are widely used for cropping tight and taking portrait, wildlife and sports images.« Back to Glossary Index
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