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Canon Patent Application: Fast EF Primes
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Canon Patent Application: Fast EF Primes

This patent application used to be for quite a few fast primes.  Interestingly enough, Canon also specified in these lenses how much focus breathing each lens has, something I've never seen before in a patent application.

Even though Canon has stated that primarily the focus will be RF lenses, R&D still has to occur for future EF lens designs if Canon is committed to keeping the EF mount around.  It could also be that these lenses are slated to appear in Canon's EF CINI lineup of primes, and not the EF stills lineup, that may explain why they listed focus breathing in the patent application.  This is especially relevant since Canon did just release a Sumire CINI PL 20mm 1.4, and 20mm 1.4 is listed as one of the embodiments in this patent application.  However, we can dream about having some small fast EF ultra wide angle primes now, can't we?

Listed in this patent is;

  • Canon EF 20mm 1.4
  • Canon EF 16mm 1.4
  • Canon EF 14mm 1.8
  • Canon EF 17mm 1.8
  • Canon EF 16mm 1.8
  • Canon EF 19mm 1.8


Canon's reason for this patent application is to design fixed focal length lenses of high optical performance and small size and weight.

US Patent Application 20190101732

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