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

Porst Color Reflex Auto 55 mm f/ 2.8 used:

NameFull namePlaceScoresRank
1arborius 65.3lvl.1 (Lens-Learner)
2Tom_GERTom Andernach1554.33lvl.4 (Lens-Pro)
3Yoonkers Tallinn32.6lvl.1 (Lens-Learner)