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

Sigma AF 50 mm f/ 2.8 EX Macro used:

NameFull namePlaceScoresRank
1Ema90 69.9999lvl.1 (Lens-Learner)
2Aravier BatizAravier Batiz Santa Monica, California.200.1lvl.2 (Lens-Adept)