Hi Lex:
<< While perusing the lens design cutaways in my booklet, it occurs to
me that certain lenses may have shared common
elements. >>
BUT, while you might see identical curvatures, the glass composition was
probably different. That is where the designer selects varying indicies
of refraction, based on the composition. There are hundreds (thousands?)
of possibilities here alone.
Gary Reese
Las Vegas, NV
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