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

Sigma AF 18-50 mm f/ 2.8 EX DC Macro used:

NameFull namePlaceScoresRank
1temas St. Petersburg72.2lvl.1 (Lens-Learner)
2Fatrai 49.7998lvl.1 (Lens-Learner)