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| Sigma 10-20mm f/4-5.6 EX DC HSM Lens for Nikon Digital SLR Cameras |
The Sigma 10-20mm F4-5 .6 EX DC HSM is, on paper at least, a very attractive selection for APS-C users looking an ultra-wideangle zoom. The standout selling point are doubtless that 10mm wideangle view and the HSM focusing motor, which when coupled with Sigma's traditionally keen pricing, makes for a compelling overall package. In the flesh that promise is heavily realized ; optically the lens is a solid if not salient performer, build quality is up to Sigma's common standards, and the focusing is so fast, silent and accurate. So far, so good.
Constructed mainly for Nikon digital SLR cameras capable of fisheye photography, the Sigma 10-20mm f 4-5 .6 lens is a engaging instrument for landscape photography and other wide angle applications. The lens offers an ultra-wide view angle of 94.5 to 56.8 degrees, with three special low dispersion (SLD) glass ingredients and three aspherical lenses system providing spork image quality throughout the entire zoom range. The lens also incorporates a Hyper Sonic Motor (HSM) to make sure quiet, high speed autofocusing added to full time manual focusing. Other features include a close focusing distance of 9.4 inches, a non-rotating lens barrel that utterly suits the petal-shaped hood (included), and a one year warrant.
Sigma offers the new ultra-wide angle telephoto lens from 15mm and this lens is the initial of its kind in the world. It may be beneficial for images of landscapes, large buildings, group photographs as well as more. The linear perspective that changes utilizing the angle-of-view gives picture an amazing feeling. Delicate composings can be adjusted by lens zooming and this is accommodating for close-up photography. Allocates deep depth of field by means of its short focal distance for amazing photographic expressions. This ultra-wide telephoto lens covers a large wide angle range from 15 mm to 30 mm. With a minimum focusing distance of 30 cm (11.8 inches) throughout the entire zoom range, it is an idealistic lens for Digital SLR Cameras.
It integrates hybrid aspherical lens in the front lens group to minimise distortion and astigmia, and molded glass aspherical lens as part of the rear lens group to minimize spherical aberration. Minimization of a typical distortion is a most important matter for telephoto lens, but Sigma has followed, to present image quality with minimum distortion using aspheric lenses. This lens in corporates an in house focusing scheme, which does away with front lens rotation. Since focusing won't interchange its overall length, this lens is straightforward to hold and use. Also it is allowing the aim of a Petal-type Hood. The lens additionally integrates Dual-Focus (DF) mechanism. It is simple to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides acceptable focusing torsion of the focalizing ring during manual focusing of each and every lens.
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