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Canon Patent Application: Canon RF telephoto zoom lenses
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Canon Patent Application: Canon RF telephoto zoom lenses

It's not surprise that Canon is throwing its engineering might behind the Canon RF mount.  We have discovered countless patents dealing with the RF mount as Canon moves the company's focus to the new mount.

This week isn't much different, another Canon patent application discussing, in this case, various telephoto zooms.  What's curious is the amount of 100-500mm lenses in this patent, and none of them got chosen as the final lens.  Ironically, I think that most of the people that read this article would rather have the 100-500's listed here.

Canon RF 100-500mm F6-6.3

 

focal length         102.00   220.29   485.00  
F number               6.00     6.43     6.43  
Half angle of view    11.98     5.61     2.55  
Image height          21.64    21.64    21.64  
total lens length    208.69   259.83   288.69  
BF                    16.13    32.43    46.87  

 

Canon RF 100-500mm F5.0 - F6.3

 

focal length         102.00   220.00   450.00  
F number               5.24     5.75     6.43  
Half angle of view    11.98     5.62     2.75  
Image height          21.64    21.64    21.64  
Total lens length    198.35   249.94   278.35  
BF                    14.56    30.77    41.71  

 

Canon RF 70-300mm F3.5-F5.6

 

focal length          72.86   133.96   289.00  
F-number               3.75     4.66     5.83  
Half angle of view    16.54     9.17     4.28  
Image height          21.64    21.64    21.64  
Lens length          162.01   202.44   237.12  
BF                    13.80    31.02    57.79  

 

Canon RF 80-250mm F4 - F5.6

 

Focal length          78.53   128.75   249.96  
F number               4.16     4.65     5.83  
Half angle of view    15.40     9.54     4.95  
Image height          21.64    21.64    21.64  
Total lens length    162.07   193.14   217.22  
BF                    12.47    21.78    39.35  

 

Canon RF 100-500mm F5.6-F6.3

 

Focal length         102.00   220.00   485.00  
F number               5.69     6.14     6.43  
Half angle of view    11.98     5.62     2.55  
Image height          21.64    21.64    21.64  
Total lens length    213.16   266.00   293.16  
BF                    11.09    26.50    42.04  

 

Canon RF 100-500mm F5-F6.3

 

focal length         102.00   219.99   450.00  
F-number               5.25     5.78     6.43  
Half angle of view    11.98     5.62     2.75  
Image height          21.64    21.64    21.64  
Total lens length    198.63   250.02   278.63  
BF                    14.61    32.10    43.74  

 

Japan Patent Application 2020-064176

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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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