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

Vivitar 75-260 mm f/ 4.5 used:

NameFull namePlaceScoresRank
1Ducky 9.2lvl.1 (Lens-Learner)
2Aravier BatizAravier Batiz Santa Monica, California.208.8lvl.2 (Lens-Adept)