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

Vivitar 28-200 mm f/ 3.5-5.3 (Kobori) used:

NameFull namePlaceScoresRank
1Jose Martins 28.3lvl.1 (Lens-Learner)
2Toon Perdaens 170.4lvl.2 (Lens-Adept)
3WeedDudeSzymon Łukawski RamesesFrankfurt am Main31.8lvl.1 (Lens-Learner)