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Canon Patent Application: 18-45mm APS-C but NOT for RF mount
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Canon Patent Application: 18-45mm APS-C but NOT for RF mount

A patent application appeared off schedule for Canon, showing an APS-C lens.  I didn't initially report on this because well, the lens is really nothing.  But since a few other sites picked it up and ran with it, I guess I had to then. Some sites have claimed this is an RF lens. It's extremely unlikely.

As far as this application; The lens is trash with a stretched image circle at even 18mm. It's also very large with a lens length of around 72mm.  The back focus distance is around 30mm to 50mm from wide to telephoto.

Canon doesn't need to do any patent applications for RF APS-C.  All of the EF-M lenses are easily movable to the RF mount.  In a kit lens case, Canon already has a working 15-45 and an 18-55mm.  There's no way Canon is going to use a back focus distance of 30mm on a mirrorless RF APS-C Lens.  The lens length of 72mm is also too large for a mirrorless APS-C lens of 45mm on the telephoto end.  Even the 18-55mm EOS-M would be 59mm and it's longer, and faster than these embodiments.

If we're going to find patent applications for RF APS-C it will be something like a 15-45mm F2.8, or a 17-55mm F2.8, or perhaps a 15-200mm super zoom.  It's not going to be an 18-45mm kit lens, which is a poor range by today's standards.

What would this lens be for? Quite possibly it's simply a patent application of an older design, from EF-S days.  Canon does patent things they probably never will ever use. However, it's really the optical formulae they are applying for a patent on. In this case, the embodiments simply aren't mirrorless.

I get that we all want to find the smoking gun that shows that Canon is making RF APS-C lenses, but in reality, they already have all they need. We'll have to wait a little while longer to find a lens that uniquely appears to be an RF APS-C lens - assuming Canon is even going to make a special one specifically for the RF system.  

Canon 18-45mm F4.5 - 6.5

focal length         18.53  30.00  43.65  
F number              4.54   5.43   6.50  
Half angle (°)       33.78  24.48  17.38  
Image height         12.40  13.66  13.66  
Total length of lens 92.00  81.80  83.05  
BF                   30.20  39.83  51.20  

Canon 18-45mm F4.5 - 6.5

focal length         18.53  30.00  43.65  
F-number              4.56   5.48   6.50  
half angle (°)       33.78  24.48  17.38  
Image height         12.40  13.66  13.66  
total lens length    89.11  81.23  81.40  
BF                   28.48  38.21  47.77  

Japan Patent Application JP2021-162822

 

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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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