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Canon patent application for some DO telephotos
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Canon patent application for some DO telephotos

Canon released a patent application for some DO telephoto lenses, showing that they are continuing to work on DO technology.

The following lenses are described in this patent, which is meant to reduce the occurrence of flare when using DO elements.

  • 800 / 5.6
  • 400 2.8
  • 200 / 2.0

Of course with any patent application, Canon may or may not decide to use the application.  However lens patents carry at good indication about what Canon is looking at.

US Patent Application 20180120582

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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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