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Canon Patent Application: Canon RF 35-135mm F2.8
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Canon Patent Application: Canon RF 35-135mm F2.8

This is a curious optical patent from Canon featuring some very uncommon focal length zooms.  Reading through the patent application, they simply seem to indicate they wanted to design a high-performance zoom.

A zoom covering 35 to 135mm however would replace a significant number of primes, would some of you like this lens?

Canon RF 35-135mm F2.8

Focus distance     35.39   69.00  132.93
F number            2.85    2.85    2.85
Half angle (°)     31.44   17.41    9.24
Image height       21.64   21.64   21.64
Lens total length 173.35  186.83  203.35
BF                 17.95   27.32   34.01

Canon RF 40-150mm F2.8

focus Distance     40.06   69.00  147.97
F number            2.85    2.85    2.85
Half angle (°)     28.37   17.41    8.32
Image height       21.64   21.64   21.64
Lens total length 173.35  191.43  218.30
BF                 17.98   26.04   38.94

Canon RF 30-110mm F2.8

Focal length       30.99   69.00  109.92
F number            2.85    2.85    2.85
Half angle ( °)    34.92   17.41   11.13
image height       21.64   21.64   21.64
total lens length 173.09  189.92  203.35
BF                 17.95   28.25   33.97

Japan Patent Application 2020-197600

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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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