astrofreak's reviews
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Sigma 18-50mm f/2.8 EX DC Macro
9 out of 10 points and recommendedexcellent color correction, very robust, smooth mechanicslens cap difficult to attach with lens hood attachedI tested this lens with my Canon 400D and had direkt comparison with a Nikon 18-70 lens.
reviewed July 24th, 2007 (purchased for $489)
The Sigma did beat the Nikon lens in many respects but I was not completely satisfied.
The Sigma 18-50 provides very sharp images in the middle part of the picture all the way up to f/2,8.
The outer parts of the picture, though, seem to be of worse quality than the Nikon which, in contrast, is not 100% sharp in the middle (f/2,8 - 4)
My Sigma seems to perform better at 18-30mm than at 50mm (weird!?) where the images are a bit blurry towards the edges (f/2,8 - 4)
Best results with aperture set at approx 6,7 - 9,5 - sharp images right to the edge.
Closing the aperture to 13 and down to 22 does worsen the image quality again.
Other positive impressions: No ghosts on nighttime shots in a city with so many bright light sources.
Edges darken very little when the aperture is set at 2,8.
Very good overall performance for a Zoom lens! Highly recommended.