Lens review

Sigma C 23 mm f/1.4 DC DN

17 June 2024
Maciej Latałło

3. Build quality

There are plenty of fast lenses that are equivalents of a full frame 35 mm device on mirrorless APS-C sensors so we had no problems whatsoever with a compilation of the following chart. As you can notice, the Sigma is optically quite complex, being defeated only by the new Fujinon, but it remains physically smaller and a bit lighter. Other lenses, for a change, are distinctly lighter than the Sigma; still the Samyang comes without an autofocus motor and the Sony is a bit slower. What's more, all lighter lenses are also optically simpler.

In the photo below the Sigma C 23 mm f/1.4 DC DN is positioned between the Fujinon XF 35 mm f/1.4 and the Sigma C 30 mm f/1.4 DC DN.

Sigma C 23 mm f/1.4 DC DN - Build quality

The lens, tested here, starts with a metal mount which surrounds contacts and a rear element, 20 mm in diameter. That element doesn’t move and is situated inside a dark, well-matted and ribbed tube. The lens seems to be completely sealed from this side and, at the same time, you can't spot any important differences between the Sony FE and the Fujifilm X mount version.

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Sigma C 23 mm f/1.4 DC DN - Build quality
Sigma C 23 mm f/1.4 DC DN with Sony E mount.

The next part is an immobile ring made of plastics and covered by fine ribs. It features inscriptions with the name, parameters of the lens, its serial number, and a white dot, making an alignment with a camera easier.

Sigma C 23 mm f/1.4 DC DN - Build quality
Sigma C 23 mm f/1.4 DC DN with Fujifilm X mount

The next immobile ring is made of metal; it features 023 number, marking the year of production, a “C” letter, meaning the lens was classified as a part of the “Contemporary” line, the focusing mechanism working range (0.25M/0.82FEET–∞) and an inscription “MADE IN JAPAN”.

Sigma C 23 mm f/1.4 DC DN - Build quality

Further on you see a manual focus ring as wide as 37 mm, most of its surface covered by rubber ribbing. It is a focus-by-wire construction; it moves smoothly and is well damped. Its full focus throw, even if you turn it quite fast, amounts to an angle of about 300 degrees, a quite significant value, allowing you very precise settings.

Sigma C 23 mm f/1.4 DC DN - Build quality

The ending of the lens consists, by and large, only of a hood mount. The front element doesn’t move and it is 35 mm in diameter. It is surrounded by an inscription with the name and parameters of the lens and information that it was produced in Japan along with a non-rotating filter thread, 52 mm in diameter.

Sigma C 23 mm f/1.4 DC DN - Build quality

The optical construction of the Sigma consists of 13 elements positioned in 11 groups. Among them you get three elements made of low dispersion SLD glass, and two others that are aspherical in shape. Inside you can also find a round aperture with nine blades that can be closed down to a value of f/16 at the maximum.

Buyers get in the accessory kit a petal-type hood and both caps. C series instruments aren't sold with any kind of a case.

Sigma C 23 mm f/1.4 DC DN - Build quality