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All About Photographic Lenses.
Specifications, comparison, reviews,
MTF-charts for lenses by Canon,
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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)