Advantages: Good build quality and good value for money . Disadvantages: Sigma`s claims not met and a slow auto focus .
...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 of colour aberrations as well as having super multi-layer lens coating to help prevent lens flare and image ghosting which are common problems with digital cameras that film cameras never had. In my opinion however the final images shot with this lens still ... ...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 focusing ...
thebigc1690 23.02.2009
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Ciao members have rated this review on average: very helpful Review of Sigma EX macro lens - 50 mm F/2.8
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Filter Size: 72mm 18-50 f2.8 EX series large aperture zoom lens designed specially for ... more
use with digital SLR cameras with a minimum focusing distance of 20cm. The Sigma Corporation is pleased to announce the launch of the new 18-50mm F2.8 EX DC MACRO lens. This lens has a large aperture of F2.8 throughout the entire zoom range- a minimum 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.Its design incorporates both glass-mold and hybrid aspherical lens technology which offers 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.
Filter Size: 55mm Optimized optical design for digital SLR cameras. Sigma launched first ... more
standard 50mm Macro lens in 1990. This was succeeded by the 50mm F2.8 EX Macro in 1998 which proved even more popular with photographers- benefiting from improved build and optical quality. The advent of digital SLR's requires optimum lens performance and therefore the very latest optical technology has been incorporated in the production of the New Macro 50mm F2.8 EX DG. This ideal standard lens sets the benchmark for digital SLR cameras
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