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

Sigma AF 90 mm f/ 2.8 Macro used:

NameFull namePlaceScoresRank
1Samuel Kruklis Basel23.3lvl.1 (Lens-Learner)
2margo 56lvl.1 (Lens-Learner)