Sigma 18-35mm f/1.8 Art HSM DC
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Sigma 18-35mm f/1.8 Art HSM DC | |||||||||||||||||||||||||||||||||||||
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Perhaps the main feature of this lens can be called the aperture characteristics: it is not only high — f / 1.8 — but also unchanged over the entire range of focal lengths. In this range — 18-35 mm (27-52.5 mm equiv. 35 mm) — this model belongs to the wide-angle. It is designed for APS-C sensors and is available for Canon, Nikon, Pentax and Sony systems. Autofocus drive — ultrasonic. Aperture with 9 blades has a minimum value of 16.
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Sigma's Art Series lens is unparalleled in native Nikon lenses or third-party products, being the world's first zoom lens with a constant f/1.8 aperture throughout its zoom range. The only such option in terms of aperture ratio is a fresh solution from another Japanese company — Tokina AT-X 14-20mm f / 2 Pro DX.
focal lengths
The focal length range of 18-35mm (27-52mm equivalent) is suitable for shooting almost any scene. The manufacturer himself positions his offspring as a solution for landscapes, portraits and studio photography. Of course, many people would like to see large figures for the maximum focal length, but then they would have to sacrifice the main feature — a constant aperture of f / 1.8. Judging by numerous tests, the lens draws a sharp picture even at the widest apertures.
Design
The lens has 17 elements in 12 groups. All of them move inside a high-quality metal case. This design is good because when focus or changing the focal length, the dimensions of the lens do not change and it does not suck dust into the camera. The front lens has a filter diameter of 72mm and is additionally treated with a multi-layer coating to help combat stray glare and reflections.
Dock station
Another interesting feature of the lens is the ability to fine-tune it through the docking station. It is screwed onto the bayonet mount and connected to the computer. Special software allows you to update the firmware or adjust the focus in order to get rid of unwanted back and front focus phenomena.
Compatibility
The Sigma 18-35mm f/1.8 DC HSM Art is a unique lens. It is compatible with Sigma, Canon, Sony, Pentax and Nikon SLR cameras. Moreover, the presence of the HSM focus drive does not limit the use of the lens with those Nikon cameras that are devoid of a “screwdriver” in their design.
Reference. Back focus is an oversight of the auto focus system, in which the camera focuses behind the subject. Front focus is a similar miss with the only caveat that focus occurs in front of the subject. Both phenomena are inherent exclusively in SLR cameras and often appear on high-aperture optics.
