Full Version: Canon patent info RF 100mm f2.8 1.4:1 macro
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They say "1:1.4" but they should say "1.4:1".

The lens would be designated a 100mm f2.8 lens, where the f-value at infinity and 100mm is f2.92 according to the patent info.
There appear to be 3 different optical designs for the 100mm f2.8 1.4x macro in this patent paper.