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Canon Patent Application: Canon RF 17-70mm F4-5.6 BR
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Canon Patent Application: Canon RF 17-70mm F4-5.6 BR

We first discovered Canon desigining a 17-70mm Full frame lens a while ago, and here is another patent application discussing such a lens.

however, this lens has a twist, as it contains a BR element (a rather large one as the element closest to the sensor is the BR element).

It isn't all good though, the lens requires image stretching basically most of the way from 17mm to at least 28mm, even though it's only slight at 28mm.   The inclusion of the BR element allows Canon some additional freedom to make this lens quite small, at a size of 80mm at its shortest length.

A lens like this could be the "bridge" lens that Canon is thinking about when coming out with an APS-C camera body.  This would be an okay lens on a crop camera (still bigger than your normal kit lenses though) and an excellent walkaround lens on a full-frame camera.

Canon RF 17-70mm F4-5.6 BR

Focal length          17.50  28.00  58.00
F value                4.10   4.50   5.70
angle of view (°)     51.50  38.16  20.77
Maximum image height  22.00  22.00  22.00
Real image height     19.47  20.98  21.94
Total length         108.50 114.27 158.50
BF                    21.38  33.45  49.01

Japan Patent Application 2021-182053

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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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