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Canon Patent Application: Canon RF 70-200 2.8L
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Canon Patent Application: Canon RF 70-200 2.8L

We know that a Canon RF 70-200 2.8 is coming, and one that is quite short for storage and features and extends as you zoom.

This is another patent application that shows relatively the same size and features of the Canon RF 70-200 2.8 patent application we found back in January.

The minimum length of this lens in the patent application is 172mm, which, when we subtract the flange distance of 20mm, we come up with an actual lens length of around 152mm.  The Canon EF 70-200 2.8L III is 199mm in length, making this new RF lens around 47mm or nearly 2 inches shorter than its EF cousin.

Focal length: 72.00 ~ 134.99 ~ 194.94 mm
F number: 2.91 ~ 2.91 ~ 2.98
Angle of view: 16.73 ~ 9.11 ~ 6.33
Image height: 21.64 mm
Lens length: 172.73 ~ 219.96 ~ 231.71 mm
Back focus: 14.37 ~ 18.40 ~ 28.12 mm

Japan Patent Application 2019-045555

Thanks hi-lows-notes

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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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