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Canon Patent Application: Canon EF-S Zoom lens
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Canon Patent Application: Canon EF-S Zoom lens

In this patent application, we see that Canon is developing another EF-S APS-C lens.  Yes, no joke ;)

Of course, it doesn't mean it will ever come to fruition, however, they were actively researching this lens back in early 2018 when this patent application was filed.

This patent application is for another EF-S 55-250mm F4-F5.6 lens.

focal length 56.47 125.07 241.01  
F number 4.16 5.00 5.88  
Angle of view 13.60 6.23 3.24  
Image height 13.66 13.66 13.66  
Total lens length 149.42 174.57 186.81  
BF 57.32 71.67 83.60 

Also, perhaps more intriguingly is an APS-C lens design for a 70-300mm which is hardly any larger than a 55-250mm

focal length 71.86 132.05 289.68  
F-number 4.65 4.95 5.85  
Angle of view 10.76 5.91 2.70  
Image height 13.66 13.66 13.66  
total lens length 177.82 204.39 146.00  
BF 39.00 39.00 39.00

Canon Patent Application 2019-179057

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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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