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Canon Patent Application: Canon RF 70-200mm, 70-240mm
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Canon Patent Application: Canon RF 70-200mm, 70-240mm

In this patent application Canon certainly appears to be focusing on the 70-200mm F2.8L IS USM that is coming out later this year for the Canon RF mount. Buried in this patent application is another intriguing lens; a 70-240mm F4.0.

It stands to reason that Canon will also be looking at the F4 zoom trinity as it's very popular on the EF mount, so could Canon be looking at expanding the 70-200 F4 to 70-240?

Focal length 72.10 131.78 242.00
F-number 4.10 4.10 4.10
Half angle of view 16.70 9.32 5.11
Image height 21.64 21.64 21.64
Total lens length 147.22 176.39 210.90 
BF 12.95 25.54 36.63

Also contained in this patent application is a consumer zoom, another 70-300 type of zoom, 

Focal length 72.10 144.31 289.00
F-number 4.60 5.68 5.88
Half angle of view 16.70 8.53 4.28
Image height 21.64 21.64 21.64
Total lens length 136.41 169.48 201.14 
BF 12.95 28.75 42.22

US Patent Application 20190302404


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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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