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Canon Patent Application: F1.8 series of primes
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Canon Patent Application: F1.8 series of primes

In this patent application, Canon describes some medium telephoto primes.

It would be no surprise to me if Canon does at least one of the lenses mentioned in this patent because small, cheap, and optically good primes are necessary in any ecosystem.  I suspect that 100mm F1.8, since the 100mm F2.0 has been a great bang for the buck for decades on the EF mount.

Canon RF 130mm F1.8

Focus distance     131.00
F-Number             1.85
half angle of view   9.38
image height        21.63
Length of lens     155.01
Back Focus          27.26

Canon RF 150mm F1.8

Focus distance     150.00
F-Number             1.85
Half angle of view   8.21
Image height        21.63
Length of lens     164.98

Canon RF 100mm F1.8

Focus distance     105.00
F-Number             1.85
Half angle of view  11.64
Image height        21.63
Length of lens     145.01

Japan Patent Application 2020-173384

 

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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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