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

Sigma DC 17-70 mm f/ 2.8-4.5 Macro used:

NameFull namePlaceScoresRank
1arborius 65.3lvl.1 (Lens-Learner)