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Canon Patent Application: Canon RF 8-15mm F4.0 Fisheye
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Canon Patent Application: Canon RF 8-15mm F4.0 Fisheye

One of Canon's more unique lenses for the EF mount is the Canon EF 8-15mm Zoom fisheye lens.  It appears that Canon feels it should be repeated on the RF mount as well.

This patent application describes a fisheye lens with a zoom from 8mm to 15mm.  With a distinctly short backfocus distance, this is certainly for the mirrorless mount.

One of the embodiments is shown below;

focal length         8.10   11.97   15.07  
F number             4.10    4.10    4.10  
Half angle of view  91.51   90.00   90.32  
Image height        11.50   17.00   21.50  
Lens total length  111.33  107.33  108.91  
BF                  13.13   24.44   31.63  

Japan Patent Application 2020-166234

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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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