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The Sony 20mm f/2.8 is an ultra-compact wide-angle prime for Sony APS-C E-mount cameras, giving a 30mm full-frame equivalent view. It uses three aspherical elements to control distortion and a quiet internal stepping motor for focus and aperture, which makes it well suited to video. Its pancake-thin aluminum body and 7.8-inch minimum focus distance set it apart from bulkier wide primes, though the f/2.8 maximum aperture is modest next to faster rivals. Owners value its size and sharpness for travel and street work; the lack of optical stabilization and the soft corners wide open are common trade-offs.
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Owners praise the lens for its pocketable size, quiet focus and useful 30mm-equivalent view, and many treat it as a default walkaround lens. Critics note soft corners at f/2.8 and the modest maximum aperture.
The Sony 20mm f/2.8 is a compact prime lens for Sony NEX APS-C mirrorless cameras with an E-mount. Its 35mm-equivalent focal length is 30mm, which makes it a wide-angle lens. The maximum aperture of f/2.8 suits low-light shooting and shallow depth of field.
Three aspherical elements correct distortion and aberrations. Images are detailed and high in contrast, including at the edges of the frame. Seven aperture blades form a near-circular opening, which gives round background blur when the aperture is wide open.
An internal stepping motor drives both focus and aperture. It runs smoothly and quietly, which suits video. Autofocus and Direct Manual Focus are supported for photo and video, and Direct Manual Focus allows precise manual focusing even in AF mode. The barrel is aluminum alloy set into a molded-plastic component, so the lens is lightweight and durable.
