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

HI Topcor 50 mm f/ 2.8 used:

NameFull namePlaceScoresRank
1nukemallStratienko IgorBlagoveshchensk2646.55lvl.5 (Lens-Expert)
2Fatrai 49.7998lvl.1 (Lens-Learner)
3gverdon 150.3lvl.2 (Lens-Adept)