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.
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.
Please Support Us
If you enjoy our reviews and articles, and you want us to continue our work please, support our website by donating through PayPal. The funds are going to be used for paying our editorial team, renting servers, and equipping our testing studio; only that way we will be able to continue providing you interesting content for free.
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 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”.
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.
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.
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.
