Canon patent info RF 100mm f2.8 1.4:1 macro - Printable Version +- Opticallimits (https://forum.opticallimits.com) +-- Forum: Forums (https://forum.opticallimits.com/forumdisplay.php?fid=4) +--- Forum: Canon EOS (https://forum.opticallimits.com/forumdisplay.php?fid=11) +--- Thread: Canon patent info RF 100mm f2.8 1.4:1 macro (/showthread.php?tid=5017) |
Canon patent info RF 100mm f2.8 1.4:1 macro - Brightcolours - 03-30-2021 https://www.canonnews.com/canon-patent-application-canon-rf-100mm-f28-macro-with-114x https://www.j-platpat.inpit.go.jp/p0200 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. |