I want to discuss about this lens in particular and why I liked this so much. Sigma 18-50 mm has a large aperture of F2.8 throughout the entire zoom range, complete with minimum distance of 20cm (7.9") and a maximum magnification of 1:3, making it ideal for close-up photography. It is specifically designed to suit the characteristics of a digital SLR camera which provides a high level of optical performance.
And because it is F2.8 this lens can take fast photography meaning it can be used for sports and any fast moving objects, also this eliminates blur from photos. The design is incorporate with both glass-mold and hybrid aspherical lens technology by which offers superior peripheral brightness, extreme high image quality as well as a compact and lightweight construction. Special Low Dispersion (SLD) and Extraordinary Low Dispersion (ELD) glass elements provided with excellent correction of color aberrations.
Another feature it provides is the super multi-layer coating that reduces flare and ghosting which is a common problem with digital cameras. A high quality image is assured throughout the entire zoom range. Also an inner focusing system eliminates front lens rotation making the lens particularly suitable for using the petal-type lens hood (supplied) plus circular polarizing filters.
The sigma macro lens is as useful as you can get, it can help you in your professional aspiration as a photographer. There might be a comparison with other camera lenses but I can proudly agree upon that the sigma macro lens is one of the best camera lenses I have ever used.
By: John Christian Smith
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