All About Photographic Lenses.
Specifications, comparison, reviews, MTF-charts for lenses by Canon, Nikon, Sony, Pentax, Olympus, Sigma, Tamron, Carl Zeiss, etc.

Sigma DC 18-50 mm f/ 3.5-5.6 used:

NameFull namePlaceScoresRank
1mmmio 168.651lvl.2 (Lens-Adept)
2Lasse Svenson 56.5lvl.1 (Lens-Learner)
3NerveNet JavierMadrid1454.45lvl.4 (Lens-Pro)