The Sigma 18-50mm f/2.8 DC DN Contemporary is a standard zoom for APS-C mirrorless cameras, covering a 27-75mm full-frame equivalent range with a constant f/2.8 aperture. Its main draw is size: it is one of the smallest and lightest f/2.8 standard zooms made for Sony E, Fujifilm X and L-mount bodies, so it balances well on compact cameras where most f/2.8 zooms feel front-heavy. Optically it uses three aspherical elements and relies on in-camera correction for distortion and vignetting, and its stepping motor gives fast, near-silent autofocus for stills and video. Against rivals like the Tamron 17-70mm f/2.8 it gives up reach and stabilization but wins clearly on weight and portability.
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Owners rate it highly, mostly for the combination of f/2.8 speed and a body small enough to leave on the camera. Complaints center on the lack of stabilization and on distortion and vignetting that depend on in-camera correction.
The Sigma 18-50mm f/2.8 DC DN Contemporary is a standard zoom lens for APS-C mirrorless cameras with an E-mount. It covers 27-75mm in 35mm-equivalent terms and keeps a maximum aperture of f/2.8 across the whole zoom range. The wide aperture helps blur backgrounds for portraits and close-ups.
The optics use three glass-molded aspherical elements, a Special Low Dispersion element and a Super Multi-Layer Coating. The design keeps the number of elements low, which holds down weight. In-camera aberration correction further reduces distortion and vignetting. The body is compact and lightweight, sized to match APS-C mirrorless cameras.
A stepping motor and an inner focus system drive fast, near-silent autofocus. This suits quiet environments, video recording and moving subjects. The minimum focusing distance is 12.1 cm (4.8 in), and maximum magnification is 1:2.8. The lens has a dust- and splash-proof design.
