Zoom lenses are designed to offer a useful range of focal lengths - TopicsExpress

Zoom lenses are designed to offer a useful range of focal lengths without having to change lenses. There are two main types of zoom lenses, constant-aperture and variable-aperture with different design demands. Learn about zoom ratios, focal lengths, and more. Sigma offers a wide range of zoom lenses, from ultrawides, to supertelephoto, and high-ratio zoom lenses for photographers. Whats your favorite Sigma zoom?

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