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Canon Patent Application: TS-E 50mm 2.8L Macro
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Canon Patent Application: TS-E 50mm 2.8L Macro

Even though this lens is released, this patent application is clearly for the 50mm TS-E Macro with a very large 33mm image height (66mm diameter image circle).

For those that love the TS-E 50mm, this patent application is for you.

Infinite distance-0.5 time 
Focal distance 51.40 50.30 
F number 2.88 4.0 
a half field angle (degree) -- 33.20 33.20 
Image height 33.63 33.63 
Whole length of the lens 153.42 178.54 
BF 55.96 81.07

Interestingly there was a second embodiment that Canon could have done for this lens, with a 1:1 Macro capability;

Infinite distance-1.1 time 
Focal distance 51.40 50.98 
F number 2.96 5.40 
a half field angle (degree) -- 33.20 33.20 
Image height 33.63 33.63 
Whole length of the lens 162.94 214.15 
BF 55.95 112.14 

It also shows that Canon may release a lens before it's actual patent has processed through the patent offices.

Japan Patent Application 2018-106141

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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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