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

Canon EF 20 mm f/ 2.8 USM used:

NameFull namePlaceScoresRank
1NaydarKopalov ValentinNovosibirsk4lvl.1 (Lens-Learner)
2Alexey_Barov 104.8lvl.2 (Lens-Adept)
3NerveNet JavierMadrid1490.25lvl.4 (Lens-Pro)