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>>223690 Modern CV 50/1.5 Nokton, Leitz 50/1.5 Summarit (succeeded Xenon), Canon 50/1.5 for RF, Nikkor 50/1.5 for very early RF (I think)
A max aperture of f/1.5 is a result of using optical formulas that aren't popular anymore, like the Sonnar.
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