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Canon patents a 17-35 IS 4-5.6
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Canon patents a 17-35 IS 4-5.6

After the release of the 24-105 3.5-5.6 STM lens, Canon's been relatively quiet on producing other STM lenses for a "cheaper" series of lenses for full frame such as what exists for crop sensor users.

This patent appears to be in line with a 17-35 4.0-5.6 IS which certainly would fit the mold of a cheaper UWA for full frame users.

                          Wide angle Middle  Looking far 
Focal distance                 17.50  25.12  34.09 
F number                       4.00    4.85   5.88 
a half field angle (degree) -- 51.03  40.73  32.40 
Image height                   21.64  21.64  21.64 
Whole length of the lens      130.88 128.52 134.05 
BF                             37.60  49.75  64.06 

Japan patent application 2017-161568


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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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