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

Sigma APO Zoom 50-200mm f/3.5-4.5 used:

NameFull namePlaceScoresRank
1Schmidtkord 8.8lvl.1 (Lens-Learner)