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Canon Patent Application: Small RF 28-70mm F2.8
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Canon Patent Application: Small RF 28-70mm F2.8

Tamron has been getting all the raves for it's small full frame 28-70mm F2.8 for mirrorless full frame, and we have a Canon patent that seems to be pretty close to the same.

One of the embodiments is pretty "ick" showing the need to stretch the image circle even to around 40mm.  Canon,let's not do that one, please.  Another embodiment is like the original 24-70mm F2.8L EF lens which is a reverse zoom.  No one liked that one either.

The one embodiment that makes the most sense is this one, with no image circle manipulation and relatively small size (around 102mm for the parked lens length)  This would make it actually smaller than the Tamron lens which is around 117mm in length.

focal length           28.84   37.17   67.90  
F number                2.91    2.91    2.91  
Half angle of view (°) 32.65   28.90   17.67  
Image height           21.64   21.64   21.64  
total lens length     122.81  111.18  132.62  
BF                     21.92   26.79   39.84 

This may be Canon's way of indicating that they are fed up with the third-party lens manufacturer's slow release to the RF mount, or that Canon wants to do it all themselves.  But if I was Tamron, I'd start moving on that RF integration.

Japan Patent Application 2021-156963

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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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