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Canon Patent Application: Canon RF Primes
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Canon Patent Application: Canon RF Primes

One thing that is notably missing is the filling out of the primes for the RF mount.  Not just the dizzyingly fast halo primes, but the ones for normal people.

This patent application discusses aberration correction when its close focus and has the embodiments of a lot of lenses that I know people want to see.  Of course with any patent application, the embodiments are just that - examples. But it does show that Canon is certainly thinking and researching these primes.  All these primes are complicated designs, and also pretty large. These are not your small Zuiko full frame primes (which I would love to see).

Canon RF 18mm F1.8

Focal length 18.54
F number 1.85
Half angle of view (°) 49.41
Image height 21.64
Lens total length 107.66
BF 14.09

Canon RF 24mm F1.8

Focal length           23.83
F number                1.85
Half angle of view (°) 42.24
Image height           21.64
Lens total length     104.66
BF                     15.90

Canon RF 20mm F1.8

Focus distance         20.48
F number                1.44
Half angle (°)         46.56
Image height           21.64
Lens total length     124.66
BF                     13.16

Canon RF 21mm F1.8

Focus distance         21.36
F number                1.85
Half angle of view (°) 45.37
Image height           21.64
Lens overall length   105.66
BF                     14.88

Canon RF 28mm F1.8

Focal length 28.08
F number 1.85
Half angle of view (°) 37.61
Image height 21.64
Lens total length 92.66
BF 12.16

Japan Patent Application 2021-193406

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How to view Japan Patent applications.

Unfortunately, there's no direct way of linking to the patent application (sad!) however, this is the easiest process to view a japan patent or application.

  1. Go to the Japan Patent Office search page.
  2. If it's a patent application (they are usually in the format of Year-Number ie: 2017-011300) then type the patent application number into the second field down from the top where it says publication of patent application. 
  3. Click on search.
  4. Then click on the patent application number link, and there's the patent application!

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