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Canon applies for a fisheye lens (one possible mirrorless prime?) patent
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Canon applies for a fisheye lens (one possible mirrorless prime?) patent

We discovered this patent, and while the full frame lens of a 15/4.0 sounds actually quite nice, there is an APS-C lens with a shorter than EF-S backfocus that would also have mirrorless implications.

Edit: as someone noted, these are 175 degrees so most likely prime fisheye lenses.

APS-C 9.5mm 4.0

Focal distance 9.50 
F number 4.10 
Imaging field angle (degree) 175 
Image height 13.66 
Whole length of the lens 63.97 
BF 23.16

Full frame EF mount 15mm 4.0

Focal distance 15.18 
F number 4.12 
Imaging field angle (degree) 175 
Image height 21.64 
Whole length of the lens 130.16 
BF 58.19

Japan Patent Application 2018-004726


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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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