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The following chart presents a selection of standard f/2.0-2.5 lenses that are designed to cooperate with full frame mirrorless cameras. As you can notice, only the huge Leica remains distinctly bigger and heavier than the new Sigma.

In the photo below the tested lens is positioned between the Voigtlander Apo Lanthar 2/50 and the reflex camera Sigma A 35 mm f/1.4 DG HSM. Still, it should be emphasized that the Voigtlander, presented in this photo, is in its folded position; if you set the focus at its minimum focusing distance its length increases distinctly.

The Sigma C 50 mm f/2 DG DN starts with a metal mount that surrounds contacts and a rear element, 29 mm in diameter. That element doesn't move and is inserted quite shallowly into the casing. The area around it is blackened and matted properly well so from this side everything looks fine.

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The proper body of the lens starts with a smooth, metal ring painted black. On that ring you can find a lot of information – an inscription with the name and parameters of the lens, the logo of the producer, a letter 'C' meaning the lens belongs to the 'Contemporary' series, the '023' mark, meaning the model year, a serial number, a white dot, making an alignment with a camera easier, and, finally, a focusing mechanism mode switch (AF/MF).

Another ring, 10 mm wide, controls aperture. On both sides of the ring you can find some convex ribbing, added for a firmer grip and better ergonomics. The ring has aperture marks from f/2.0 to f/22, with intermediate points every 1/3 EV, and also an A value that allows you automatic control of parameters from the camera menu. Its performance is beyond reproach.

Then you see an immoblie part of the barrel with an inscription 'MADE IN JAPAN' and the focusing mechanism range '0.45M/1.48FEET–∞'.

Another ring, 16 mm wide, controls manual focus. It comes without any markings and its main part is covered by ribbing that makes your grip more firm. The ring is a focus-by-wire construction and it moves quite smoothly. Even if you turn it faster running through the whole distance range takes an angle of about 180 deg. It's a high value, allowing you very precise settings.

The lens ends with an immobile, metal ring on which you can find a hood mount. The mount surrounds a non-rotating filter thread, 58 mm in diameter.

The front element, 29 mm in diameter, doesn't move. It is surrounded by a piece of black barrel without any inscriptions.

When it comes to optical construction you deal here with 11 elements positioned in 9 groups. One element is made of low dispersion SLD glass and three others are aspherical in shape. Inside you can also find a round aperture with nine blades which can be closed down to a value of f/22.

Buyers get in the box with the lens: a metal hood, a rear cap and two front caps – one classic, made of plastics, the other magnetic and made of metal, a really cool solution. Series C accessory kits don't include any kind of case.