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Canon Patent Application: DO Supertelephotos
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Canon Patent Application: DO Supertelephotos

Another patent for diffractive optics (DO) super telephotos has appeared.  This seems to be a subject of ongoing R&D inside of Canon, with several patent applications listed for these lenses using diffractive optics.

There was a rumor about super telephotos for the RF mount using Diffractive Optics, perhaps this is related.  For supertelephoto lenses, the back focus is so large, that the lens could be made for just about any mount.

This patent application describes two lens embodiments, one for a 300mm 2.8 and another for a 400mm 2.8 DO supertelephoto.

Focal distance      392.58 
F number              2.91 
a half field angle    3.15 
Image height         21.64 

length of the lens  363.53 
BF                   59.15 

Focal distance      293.40 
F number              2.91 
a half field angle    4.22 
Image height         21.64 
length of the lens  274.00 
BF                   59.35

Japan Patent Application 2018-189878

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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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