Lens review

Sigma C 90 mm f/2.8 DG DN

8 November 2021
Maciej Latałło

3. Build quality

The dimensions of the new Sigma C 2.8/90 don't differ much from these of older lenses with similar parameters. In the photo below we compared it to some reflex camera 1.8/85 models – you see the Sigma positioned between the Canon EF 85 mm f/1.8 USM, and the Nikkor AF-S 85 mm f/1.8G.

Sigma C 90 mm f/2.8 DG DN - Build quality

The Sigma C 90 mm f/2.8 DG DN starts with a metal mount surrounding contacts, and a rear element, 30 mm in diameter. That element doesn't move and is positioned about 0.5 cm inside the barrel. The area around it is very well blackened and matted.

Sigma C 90 mm f/2.8 DG DN - Build quality

The proper barrel of the lens starts with 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 the focusing mechanism mode switch (AF/MF). There is also an inscription 'MADE IN JAPAN' and focusing mechanism range: '0.50M/1.64FEET–∞'.

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Sigma C 90 mm f/2.8 DG DN - Build quality

Then you see an aperture ring, 9.5 mm wide, with protruding ribbed area on its sides to make your grip firmer and the turning - easier. The ring comes with aperture markings from f/2.8 to f/22, with 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 is beyond reproach.

Sigma C 90 mm f/2.8 DG DN - Build quality

The next ring, 25 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 even if you turn it quickly its focus throw amounts to almost 200 degrees. When you move the ring slower you can reach even 700 degrees. Both these values are very high, allowing you very precise settings.

The lens ends with an immobile, metal ring with a hood mount. The mount surrounds a non-rotating filter thread, 55 mm in diameter.

The front element is 30 mm in diameter and it doesn't move. It is surrounded by black casing without any inscriptions.

Sigma C 90 mm f/2.8 DG DN - Build quality

When it comes to optical construction you deal here with 11 elements positioned in 10 groups. One element is aspherical and as many as five others are made of low dispersion SLD glass. 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, the 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.

Sigma C 90 mm f/2.8 DG DN - Build quality