Description of Sigma Lens 18-200/f3.5-6.3 DC OS II for Nikon
- Sigma is the best generation of 18-200 mm F3.5-6.3 II DC OS HSM 18-200 mm lens is best selection for Canon cameras. Compared with the previous generation product, it is most important improvement is reflected in two aspects: Add a FLD lens; stature becomes more thin and lightweight. But did not affect the picture quality, video performance is more prominent than the previous generation, the structural design of Sigma's new SLD low-bulk lens with fluorite-class FLD low scattered lenses, aspherical lens and lens, have a significant effect. From the manipulation of feelings is concerned, although the lens weight is small, there is no pressure feel of a professional lens, the overall feeling of control, but when used with a mid-range SLR and universal SLR supporting excellent. The zoom ring, each function to open the key location of the design that is a reasonable operating feel very comfortable.High quality plastics have been used for much of the lens' construction, with a matt finish that doesn't mark easily and the lens mount is made of metal. A wide rubberised zoom ring fills much of the lens barrel and the zoom action feels very smooth indeed, having just enough resistance to prevent the zoom creeping through the range when pointed downwards. A locking switch is provided to hold the lens at 18mm during transport.A silent HSM focusing motor powers the focusing mechanism, resulting in reasonably quick focusing, although not as fast as some equivalent lenses. Moving subjects can be a challenge to accurately get in focus as a result. Focusing is performed internally, so the 62mm filter thread does not rotate, making this lens ideal for use with polarising and graduated filters.Sigma's OS (Optical Stabiliser) system offers effective correction of approximately 4 stops, enabling easy handheld photography. HSM (Hyper Sonic Motor) ensures quiet, high-speed auto focus and the inner focus system eliminates front lens rotation, making the lens particularly suitable for using the supplied petal-type lens hood and circular polarizing filters. The rounded 7 blade diaphragm creates an attractive blur to the out of focus areas of images.