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Canon Patent Application: Some odd DO telephotos
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Canon Patent Application: Some odd DO telephotos

These have to be some of the strangest lens designs I've seen.  These are obviously experimental in nature.  But they are some very simplistic (and very slow) supertelephoto lenses using DO elements.

They are looking for in this patent application; 

 a good balance between reduction of change of the optical performance caused by an object distance and downsizing and weight reduction of the optical system.

The lens characteristics are;

Focal Length 780.00
F-Number 11.00
Half Field Angle 1.59 (.degree.)
Image Height 21.64
Total Length of 389.25
Lens BF 127.73

Focal Length 585.00
F-Number 10.99
Half Field Angle 2.12 (.degree.)
Image Height 21.64
Total Length of 334.87
Lens BF 134.40 

Focal Length 390.00
F-Number 8.20
Half Field Angle 3.18 (.degree.)
Image Height 21.64
Total Length of 250.00
Lens BF 92.99

US Patent Application 20190346660

 

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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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