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

Sigma 30 mm f/ 2.8 EX DN used:

NameFull namePlaceScoresRank
1Carlos Aversa 19.6lvl.1 (Lens-Learner)
2mzagdanski MariuchKołobrzeg62.75lvl.1 (Lens-Learner)
3LucisPictor Hessen445.203lvl.3 (Lens-Competent)