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

Sigma 400 mm f/ 5.6 used:

NameFull namePlaceScoresRank
1stephen marmaroff 51.2lvl.1 (Lens-Learner)
2Osika 15.8lvl.1 (Lens-Learner)
3Slawomir 3.6lvl.1 (Lens-Learner)
4Greg Wojdak 30.5lvl.1 (Lens-Learner)