Lens review

Sigma C 56 mm f/1.4 DC DN

22 December 2018
Arkadiusz Olech

3. Build quality

The following chart presents a comparison between properties of different mirrorless lenses designed for cameras with smaller sensors which provide similar angles of view as the tested Sigma. It is clear that Sigma constructors were determined to keep dimensions and weight as low as possible.

In the photo below the tested Sigma C 56 mm f/1.4 DC DN is positioned between the Fujinon XF 56 mm f/1.2 R and the Voigtländer Macro APO Lanthar 65 mm f/2.

Sigma C 56 mm f/1.4 DC DN - Build quality

The lens starts with a metal mount which surrounds contacts and a rear element, 21 mm in diameter. That element doesn’t move and round it you see black, well matted tube covered by ribs. From this side, the lens seems to be sealed.

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Sigma C 56 mm f/1.4 DC DN - Build quality

The proper body of the Sigma starts with a small, plastic ring on which you can find a white dot, making an alignment with a camera easier, the name and parameters of the lens and its serial number.

Sigma C 56 mm f/1.4 DC DN - Build quality

Another immobile ring is already made of metal; it features ‘018’ inscription, marking the year of production, a letter “C”, meaning the lens was classified as “Contemporary”, and the working range of the focusing mechanism (0.5M/01.64FEET–∞) along with an inscription „MADE IN JAPAN”.

Sigma C 56 mm f/1.4 DC DN - Build quality

Further on there is a manual focus ring as wide as 29 mm, most of its surface covered by rubber ribbing. It is a focus-by-wire construction which turns smoothly and is well damped. It doesn’t feature any distance or depth of field scale and its range depends on the speed of your turning.

The ending of the lens consists of just a hood mount. The front element itself doesn’t move and is 38 mm in diameter. It is surrounded by an inscription with the name and parameters of the lens, information that it was produced in Japan, and a filter thread, 55 mm in diameter.

Sigma C 56 mm f/1.4 DC DN - Build quality

When it comes to optical construction you deal here with 10 elements positioned in 6 groups. One of these is made of low dispersion SLD glass and another is aspherical in shape. Inside there is also a round aperture with nine blades which can be closed down to a value of f/16 at the maximum.

Buyers get a hood and both caps in the box with the lens.

Sigma C 56 mm f/1.4 DC DN - Build quality