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Canon Patent Application: Canon RF 24-70 F4L
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Canon Patent Application: Canon RF 24-70 F4L

One of my biggest waits for the RF mount is the F4.0 trinity.  This lens, the 24-70mm isn't as important, however it atypically has better optical performance than the bigger zoom ratio 24-105mm.

This patent application details multiple different optical designs, however, they all are quite similar.  Given the backfocus distance and the image height, these designs are most certainly for the RF mount.

Canon RF 24-70mm F4L IS USM

Focal length         24.73  40.97  67.90    
F Number              4.12   4.12   4.12     
Half angle of view   41.19  27.84  17.67     
Image height         21.64  21.64  21.64     
Total lens length   145.52 135.76 160.05     
BF                   18.00  25.64  55.54 

Japan Patent Application 2020-14006

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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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