Then again, you might just see some web artifacts, or read something unrelated to actual enlarging, or
more likely, encounter some pure BS, a role at which the web excels. Talk to someone who actually uses specific lenses for a specific application. "Sample variation" might make sense if something was
made in the 1940's, but quality control by the major manufacturers of top-end lenses has been quite
predictable for quite awhile now. Some offer more than one quality grade of enlarging lens, so that can sometimes be a factor. The Componon series has been around a long time, with some of the Componon
S preceding the modernization of Schneider, and some after.