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Canon Patent Application: Canon RF Lenses
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Canon Patent Application: Canon RF Lenses

Canon has been applying for many patents on the RF system - which makes sense, they were starting from scratch and making an entirely new system.  They probably threw every engineer they had into the process.  A lot of designs probably won't ever get developed, but some may be the basis of lenses we see in the future.  A really necessary element of Canon RF lenses, that hasn't yet appeared is macro photography lenses.

This patent application deals with high-speed focusing and keeping the aberrations low.  In it, details several intriguing macro lenses some of them we have similar models on the EF mount.  I do believe these are 1:1 macros, I think that's what β = -1.0 is, but if someone can confirm that, I'd be more than happy. ;)

Canon RF 100mm F2.8 Macro

Focal length    97.62
F number         2.92
angle of view   12.50
Image height    21.64
lens length    123.21
BF              18.86

Canon RF 90mm F2.8 Macro

Focal length    87.04
F number         2.92
angle of view   13.96
Image height    21.64
lens length    135.86
BF              19.58

Canon RF 180mm F2.8 Macro

focal length   189.96
F number         2.92
angle of view    6.50
Image height    21.64
lens length    185.34
BF              23.95

Canon RF 65mm F2.8

Focal length    65.13
F number         2.92
angle of view   18.38
Image height    21.64
lens length    135.78
BF              21.40

Japan Patent Application 2020-060661

Japan Patent Application 2020-060660 from Canon seems to be more of the same, with various designs of lenses that are high in magnification (β > -.50).  The designs in this patent application, seem to fixate more around a 100mm focal length with designs such as this;

focal length   95.36
F number        2.92
angle of view  12.78
Image height   21.64
total length  125.16
BF             15.84



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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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