Richard S. writes:
<< So this lens works better with colour film and one could call it a
"colour lens", while the old design was an "B&W lens". >>
Something of an aside, but related to color vs. B&W lenses: We now have
age discolored lenses that used Thorium Floride (radioactive) elements,
like various Pentax M42 thread and 67 system lenses, the 1st generation
50mm f/2 Summicron-M and the original concave Canon FD 35mm f/2. Their
color transmission has become so off that taking color slides with them
result in a noticable color cast, but still quite useful for B&W work.
This early application of rare earth glass gave photography the very
first "ED" lenses. In the case of the Canon FD 35mm f/2, there has never
been a better design for detail rendering than the first, radioactive
one.
Not what you had in mind with your fine comments, but I think an
interesting aside.
Gary Reese
Las Vegas, NV
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