Although zoom lenses are certainly versatile and convenient, they do have some drawbacks, including relatively small maximum apertures. A typical 28-90mm equivalent zoom may provide an aperture of f/3.5 at short focal lengths but it will be f/5.6-6.3 at longer zoom settings. Granted, a few high-grade zooms feature a maximum aperture of f/2.8, allowing for faster shutter speeds in low-light photography. By comparison, a fixed focal length lens can feature a much wider maximum aperture.
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