The following chart presents a comparison between basic parameters of the new Sigma and other full frame lenses with similar parameters.
As you can notice both the Sigma and the Tamron are here the lightest and their physical dimensions are relatively moderate. If you compare them to the big Tokina designed for reflex cameras they seem to be tiny.
In the photo below the Sigma C 16-28 mm f/2.8 DG DN is positioned between the Sigma A 35 mm f/1.4 DG HSM and the Voigtlander Apo-Lanthar 2/50.
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The lens, described here, starts with a mount that surrounds contacts and a rear element, 20 mm in diameter. The element changes its position – at 16 mm it is hidden about 1 cm deep inside the barrel and when you pass to 28 mm it hides almost 2 cm inside. It is surrounded by a part of very well matted and blackened casing but between the sleeve with the element and the barrel you can spot a slit through which some parts of the inner construction can be spotted. Fortunately, they are few and far between and seem to be hidden pretty well.
The first part of the proper barrel is a black, immobile ring made of plastics that increases its diameter very quickly. The ring features a white dot, making an alignment with a camera easier, and the model year of the instrument, in this case 022, information that the lens was made in Japan, and an inscription with the minimum focusing distance, 0.25M/0.82FEET.
Further on, you see a ribbed zoom ring, as wide as 28 mm, with focal length markings at 16, 18, 20, 22, 24, and 28 mm. It is properly damped, moving smoothly and evenly through its entire range.
Another ring, immobile this time, features an inscription with the name and basic parameters of the lens, the logo of the producer, a serial number, 'C' meaning the lens belongs to the 'Contemporary' series, and an AF/MF toggle.
Then you find a manual focus ring, 20 mm wide, almost completely covered by ribbing in order to ensure you a firmer grip. It's a focus-by-wire construction and its focus throw amounts to an angle of about 250 degrees – more than enough for comfortable work and precise settings.
The lens ends with an enlarged part of the barrel on which you see a petal-type hood mount
The front element is 44 mm in diameter, convex and immobile, so the lens doesn't change its dimensions during focusing. It is surrounded by black barrel with dark inscriptions concerning basic parameters of the lens, its place of production, and a non-rotating filter thread, 72 mm in diameter.
When it comes to optical construction you deal here with 16 elements positioned in 11 groups. The number of special elements is impressive, because we have as many as five elements made of low dispersion FLD glass which properties are similar to properties of expensive fluorite and there are four aspherical elements as well. Inside you can also find a circular aperture with nine blades that can be closed down to a value of f/22 at the maximum.
Buyers get in the box with the lens: both caps and a petal-type hood.
