When it comes to dimensions, the new Sigma C 2.8/90 doesn't stick out in any way when compared to older lenses with similar parameters. In the photo below we stacked it up with the Canon EF 85 mm f/1.8 USM and the Nikkor AF-S 85 mm f/1.8G so two reflex camera 1.8/85 lenses.
The Sigma C 90 mm f/2.8 DG DN starts with a metal mount that surrounds a contact plate and an immobile element 30 mm in diameter. The element is embedded about 0.5 cm deep in the mount and the area round it is very well blackened and matted.
The proper body of the lens starts with a metal, smooth ring painted black. On that ring there are a lot of features and information – an inscription with the name and parameters of the lens, the logo of the producer, a letter 'C' meaning the lens belongs to the 'Contemporary' series, '021' meaning the model year, a serial number, a white dot, making an alignment with a camera easier, and a focusing mechanism mode switch (AF/MF). Of course there is also an inscription 'MADE IN JAPAN' and the focusing mechanism working range '0.50M/1.64FEET–∞'.
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Then you see an aperture ring, 9.5 mm wide, with protruding ribs on both sides to ensure a firmer grip and better ergonomics. The ring comes with aperture markings from f/2.8 to f/22, with intermediary positions every 1/3 EV, and an A value that allows you automatic control of parameters from the level of a camera menu. Its performance is beyond reproach.
The next ring, 25 mm wide, allows you to set the focus manually. It doesn't feature any markings and the majority of its surface is covered by ribbing. It is a focus-by-wire construction that works very smoothly. Even if you turn it quickly, running through the whole distance range needs an angle of almost 200 degrees. If you turn it slowly the focus throw can reach even 700 degrees or so. Both these values are very high, allowing you very precise settings.
The lens ends with an immobile, metal ring on which you can find a hood mount. The mount is surrounded by a non-rotating filter thread, 55 mm in diameter.
The front element, slightly convex, is 30 mm in diameter and it doesn't move. It is surrounded by a black fragment of casing, this time without any inscriptions.
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 of them are made of low dispersion SLD glass.Inside you can also find a round aperture with nine blades which can be closed down to a value of f/22 at the maximum.
Buyers get in the box: a metal hood, a rear cap and two front caps – one classic, made of plastics, the other magnetic and made of metal, a really cool solution. Series C instruments accessory kits don't include any kind of case.
