The following chart presents a comparison between basic parameters of different 24-25 mm f/1.8-2.0 lenses designed for full frame mirrorless cameras. On one end you get a big, heavy Nikkor, on the opposite one a lightweight Samyang, its barrel dominated by plastics, easily the smallest instrument here. Compared to that the Sigma, almost completely made of metal, presents itself quite favourably as it is neither too big nor too heavy.
In the photo below the lens, tested here, is positioned between two reflex camera lenses, the Canon EF 35 mm f/2 IS USM and the Sigma A 35 mm f/1.4 DG HSM.
The Sigma C 24 mm f/2 DG DN starts with a metal mount surrounding contacts, and a rear element, 27 mm in diameter. That element doesn't move and is positioned quite shallowly inside the barrel; additionally it is partially hidden behind a black 30x25mm frame that invades slightly the field of view of the lens. The parts inside the mount are very well blackened and matted so from this side everything looks as it should.
The proper body of the lens starts with a a smooth, metal ring painted black. The ring features a lot of information: the name and parameters of the lens, the producer's logo, a 'C' letter, meaning the lens is qualified as a 'Contemporary' device, '021' meaning the model year, the serial number, a white dot, making an alignment with a camera easier, and finally the focusing mechanism mode switch (AF/MF).
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Then you see an aperture ring, as wide as 12 mm, with protruding ribbed area on its sides to make your grip firmer and the turning - easier. The ring comes with aperture markings from f/2.0 to f/22, intermediary points every 1/3 EV, and also an A value, allowing you to set parameters from your camera level. The ring performs as it should and, generally, is beyond reproach.
Then you see an immobile part of the casing with an inscription 'MADE IN JAPAN' and the focusing mechanism range, '0.245M/0.804FEET–∞'.
The next ring, 17 mm wide, allows you to set focus manually. It doesn't feature any markings and is covered by ribs to ensure you a better grip. It is a focus-by-wire construction and it turns very smoothly. Even if you do it quickly its focus throw amounts to over 400 degrees. It is a very high value, allowing you very precise settings.
The lens ends with an immobile, metal ring and a hood mount. The mount surrounds a non-rotating filter thread, 62 mm in diameter.
The front element, slightly convex and immobile, is 34 mm in diameter and it doesn't move. It is surrounded by black casing without any inscriptions.
When it comes to optical construction you deal here with 13 elements positioned in 11 groups. One element is made of low dispersion FLD glass which properties are similar to properties of expensive fluorite, two others are made of low dispersion SLD glass and there are two aspherical elements as well. Inside you can also find a round aperture with nine diaphragm blades that can be closed down to a value of f/22 at the maximum.
Buyers get in the box with the lens: a metal hood, a rear cap, and two front caps, one classic, made of plastic, and other made of metal - a really nice solution. The producers don't add any kind of a case with C series lenses.
