February 2018
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Sigma 17-50 F2

Sigma 17-50 F2.8 EX DC OS HSM

Recently, Sigma one of the leading American corporations of lenses announced its new Sigma 17-50 F2.8 EX DC OS HSM lens for the market. It is an ultra compact lens of latest cameras for photography with an overall length of just 3.6 inches where as talk about the dimensions and weight of this lens is comparatively perfect as compare to other with 84mm x 92mm (3.3in ? 3.6in) and just 565g or 19.9oz in weight. It is made up of tightly assembled combination of metal and high quality parts etc.

Sigma 17-50 F2.8 EX DC OS HSM has two glass molds, two latest camera lens features FLD (“F” Low Dispersion) glass elements, and one hybrid aspherical lens that provides great correction for any kind of aberration. Furthermore, it covers a focal length of a 17mm wide angle, has a minimum focusing distance of 11 inches in its zoom range and a maximum magnification ratio of 1:5.

Its OS function offers the use of shutter speeds approximately four stops slower than would otherwise be possible. Only Sigma has made it possible to utilize an anti-shake system in either the latest camera body or the lens. The compensation for camera shake is visible in the view finder for all mounts, which makes accurate focusing fast and easy.

Another best quality of this quality lens of latest cameras for photography is that it is very pretty and stays a little short of the high expectations. Like its predecessor (AF 18-50mm f/2.8 HSM DC EX macro), it uses a mono-cam system (one inner lens tube) to extend the lens when zooming towards the tele setting. Moreover, its front element does not rotate the zoom ring has a pleasant, smooth action whereas the focus ring has no friction in manual mode. Its focus ring is coupled to the AF mechanism so it rotates during focus operations – this is somewhat disappointing for a high end product actually.

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