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The Sigma 30mm f/1.4 DC DN Contemporary is a fast standard prime for Sony APS-C bodies, giving a 45mm full-frame equivalent view. Its f/1.4 aperture gathers a lot of light and blurs backgrounds, which makes it a strong everyday lens for street, portrait and low-light shooting. It is smaller and lighter than most f/1.4 full-frame primes and costs far less than Sony's own fast primes, though it lacks optical stabilization and weather sealing. Owners praise its sharpness and value but note soft corners wide open and some focus noise on older bodies.
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Reviewers and owners rate the Sigma 30mm f/1.4 highly as a value fast prime, calling it sharp and compact with pleasing background blur. Complaints center on soft corners wide open, vignetting, and autofocus noise or breathing on some bodies.
The Sigma 30mm f/1.4 DC DN Contemporary is a standard prime lens for Sony E-mount APS-C cameras such as the a6700, a6400 and ZV-E10. On these bodies, with Sony's 1.5x crop factor, it gives a field of view equivalent to 45mm on a full-frame camera.
It has a maximum aperture of f/1.4, which lets in a lot of light for indoor and low-light shooting and gives a shallow depth of field for background blur. The optical design includes a double-sided aspherical element and high-refractive index glass.
Autofocus is driven by a stepping motor (STM) that works quietly for video. The lens supports Sony's Real-Time Eye AF for humans and animals. It weighs 265 g (9.3 oz) and is under three inches long.
