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Canon Patent Application: Canon RF 24-85mm, 24-70mm
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Canon Patent Application: Canon RF 24-85mm, 24-70mm

This patent application appears to be for a Canon RF lens mount lens of 24-85mm in focal length with a constant aperture of F4.

One of the very necessary things for the RF mount, is a series of lighter weight and F4 zooms, not only the heavy and large exotic lenses.  This would be a welcome addition to the RF lens ecosystem.  Interestingly this lens also shows a significant ingress into the RF mount having a backfocus of 13.50mm where the RF mount has a distance of 20mm.  There is also two 24-70mm lens designs as well, however one is more unlikely because of the extreme mount ingress, having a back focus of only 7.69mm.

Focal Length 24.72  44.55 82.99
F-Number      4.12   4.12  4.12
Image height 21.64  21.64 21.64
BF           13.50  27.08 51.57

Focal Length 24.71  39.20 67.99
F-Number      4.12   4.12  4.12
Image height 21.64  21.64 21.64
BF            7.69  17.60 35.47

Focal Length 24.71  39.93 67.99
F-Number      4.12   4.12  4.12
Image height 21.64  21.64 21.64
BF           13.50  24.36 42.60 

US Patent Application 20180348481

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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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