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Canon Patent Applicaton: RF Macro Lenses
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Canon Patent Applicaton: RF Macro Lenses

In this patent application, Canon describes a series of macro lenses of fairly long focal lengths.  Some of the lenses would double as a prime and also a .5x macro which would be certainly useful, especially with a higher megapixel camera where you have more freedom to crop.

This patent application according to canon has the goals of;

To provide an optical system capable of expanding a close range in a small size while suppressing the number of focus groups, and an image pickup apparatus having the same.

Canon RF 135mm F2.0 .5x Macro

Focal length [mm]      133.00
Fno                      2.05
Half angle of view [°]   9.24
Image height [mm]       21.64

Canon RF 200mm F2.4 .5x Macro

Focal length [mm]      200.00
Fno                      2.40
Half angle of view [°]   6.18
Image height [mm]       21.64 

Canon RF 200mm F2.8 1x Macro

Focal length [mm]      199.90
Fno                      2.80
Half angle of view [°]   6.18
Image height [mm]       21.64

Japan Patent Application 2022-022595

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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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