"Answer not a fool according to his folly, lest thou also be like unto him.
Answer a fool according to his folly, lest he be wise in his own conceit." -- Proverbs 26:4,5
Hmm, to answer or not ?? :dunno:
Sorry, OT, but "lest he be wise in his own conceit"... here goes:
See:
Carl Zeiss Lens Design
Quote: "The
Tessar design was produced in
1902, and awarded a US patent in
1903. When the patent expired in 1920 there were many variants on the Tessar design released other companies, such as some of Kodak's Ektars and Schneider's Xenars. The famous Leica
50mm f/3.5 Elmar lens released in
1920 was a
Tessar type lens...."