... This particular lens (Sigma EX macro lens - 50 mm F/2.8) allows you to focus on objects as close in as 20cm.
Sigma make many other claims about this lens, such as it having (SLD) special low dispertion and (ELD) extra low dispertion glass elements which help to provide excellent correction ... Read review
This lens has a large aperture of f/2.8 throughout the entire zoom range, a minimum ... more
focusing distance of 20cm (7.9 ) and a maximum magnification of 1:3, making it ideal for close-up photography. Specially designed to suit the characteristics of digital SLR cameras, this lens provides a high level of optical performance.It incorporates both glass-mold and hybrid aspherical lens technology - offering superior peripheral brightness, extremely high image quality as well as a compact and lightweight construction. Special Low Dispersion (SLD) and Extraordinary Low Dispersion (ELD) glass elements provide excellent correction of color aberrations. The super multi-layer lens coating reduces flare and ghosting, a common problem with digital cameras. High image quality is assured throughout the entire zoom range. 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.
"...not the case with this Sigma lens.
This lens focuses very smoothly, a bit slowly (this is normal with macro lenses) but most importantly with macro it focuses quietly, I say quiet is most important because a lot of people that shoot macro shoot insects and butterflies and a noisy focus ring can soon frighten the subject off and then you end up with a photo of the branch or leaf that they were once sat upon instead of the creature itself, so for ..."
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Product Information for "Sigma EX 18-50mm F2.8 DC" »
Manufacturer's product description
F2.8 large aperture standard zoom lens designed specifically for Four Thirds system. This zoom lens is exclusively designed to ensure compact and lightweight construction as well as provides the utmost correction against lateral chromatic aberration, which is a critical problem for digital SLR cameras.