Đánh giá lens sigma 19mm f2 8 ex dn năm 2024

In January 2012 the Sigma company presented two new lenses designed for mirrorless cameras - the Sigma 19�mm f/2.8 EX DN and the Sigma 30�mm f/2.8 EX�DN. To tell you the truth that launch took me by surprise. In the case of the Micro 4/3 system a small sensor allows to construct physically small and fast lenses so quite significant dimensions of the Sigma with the aperture of f/2.8 don’t fit here at all. In the mirrorless systems of Fuji, Samsung and Sony we deal with APS-C sensors but even here the f/2.8 aperture fastness is hardly impressing. Samsung proved that point constructing a “pancake” 2/30 lens which additionally is characterized by good optical properties. Taking it all into account the Sigma launches were a complete mystery to me.

The mystery was solved at the beginning of February 2012 when Sigma showed its new compact cameras from the DP series, equipped with a Foveon sensor of the APS-C format. It turned out these are offered with 2.8/19 and 2.8/30 lenses. It seemed Sigma wanted to kill two birds with one stone. As they’ve already designed lenses to suit their own compacts, it wasn’t such a big problem to adjust them by adding other mounts. However, the situation is not as simple as it seems at first glance. Although the basic parameters of mirrorless cameras’ lenses and those of the Sigmas DP are the same, they still differ in some crucial points like the optical construction. Apparently it was easier for the Sigma optics constructors to change the whole construction slightly than to change the aperture or design a new lens from scratch.

As the NEX system doesn’t suffer from the surfeit of lenses, the offer of Sigma might seem interesting to many owners of mirrorless Sony devices. The 19 mm Sigma model can be also a sensible and cheaper alternative to the Panasonic 1.7/20 for those who have Micro 4/3 cameras. That’s why we decided to check its optical and mechanical properties.

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We would like to thank Sigma ProCentrum for borrowing the lens for testing purposes.

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Manufacturer description: This high-performance wide angle lens is designed exclusively for mirrorless interchangeable lens cameras and has the equivalent angle of view as a 38mm (35mm equivalent focal length) on the Micro Four Thirds systems and 28.5mm (35mm equivalent focal length) on the E-mount systems. Three glass mold aspherical lenses provide excellent correction for distortion, color aberration and field curvature. The inner focusing system corrects the fluctuation of aberration to maintain image quality regardless of the focal distance. Sigma's Super Multi-Layer Coating reduces flare and ghosting and provides sharp and high contrast images even at the maximum aperture. The superior telecentric optical design improves image quality throughout the frame. This lens benefits from a newly developed linear AF motor which moves the lens elements directly without the need for gears or the drive of other mechanical parts. This system ensures accurate and quiet autofocusing, making the lens suitable for video recording as well as still photos. The lens features a rounded 7 blade diaphragm creating an attractive blur to the out of focus areas of the image. This Sigma 19mm F2.8 EX DN has a minimum focusing distance of 20cm/7.9in and a maximum magnification ratio of 1:7.4.

Lens type Prime lens Focal length 19 mm Image stab. No Lens mount Micro Four Thirds, Sony E Max aperture F2.8 Min aperture F22 Min focus 0.20 m (7.87″) Weight 140 g (0.31 lb) Length 46 mm (1.81″)

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