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Canon Patent Application: Canon RF 24-70mm Kit lens
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Canon Patent Application: Canon RF 24-70mm Kit lens

One thing I'd love is a nice small kit lens for the RF system. This lens seems to fit the bill as it describes a 24-70mm kit lens with variable aperture.

Unfortunately as with most of Canon's lens patents for the RF mount, making it small comes with a cost, and this cost is wide-angle performance as the lens has to stretch the image circle.

Some of the embodiments are shown below essentially this lens is around 80mm in lenght.   Consider that the 24-105 kit lens is 115mm, this is around 35mm smaller in length.  So nice and compact.

Canon RF 24-70mm F4-7.3

focal length       24.86  38.85  68.13  
F-number            4.12   5.10   7.31  
Angle of           38.31  29.11  17.62  
Image height       19.64  21.64  21.64  
total lens length 102.91  97.95 104.95  
BF                 13.00  22.13  37.46  

Canon RF 28-70mm F4-7.3

Focus distance     28.68  42.81  67.45  
F number            4.12   5.25   7.16  
Angle              34.41  26.81  17.78  
Image height       19.64  21.64  21.64  
total lens length 102.53 115.51 105.26  
BF                 13.00  20.64  36.88  

Japan Patent Application 2021-196449

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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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