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New patent application for 18-200 zoom for APS-C cameras
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New patent application for 18-200 zoom for APS-C cameras

The 18-200mm is becoming long in the tooth for the EF-S lens lineup.  Most of the other lenses have been STM'ed and improved by now, sans this one.

This patent is for improved optical performance on large zoom ratio lenses and has the following characteristics embodied;

Zoom ratio 10.38 
                         Wide angle Middle Looking far 
Focal distance          18.60       49.08  193.00 
F number                 3.59        4.89    5.88 
Field angle             36.29       15.55    4.05 
Image height            13.66       13.66   13.66 
length of the lens     145.04      172.07  200.21 
BF                      38.23       59.69   74.12 

Japan Patent Application 2017-219655


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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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