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Canon Patent Application: Canon RF 85mm F1.8 Macro
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Canon Patent Application: Canon RF 85mm F1.8 Macro

Canon has been busy over the past 3+ years developing a new array of lens designs for the new RF mount.

This one is interesting, given the rumor that just surfaced today, but here we have an RF 85mm F1.8 and RF 100mm F2.8

After some discussion (see below) and revisiting this patent application, it seems likely that these are made to also take the place of macro lenses.

There is some mention of magnification, but I do believe the Japanese translation is mixing it up somewhat and its value meaning is not clear.  It's not the usual 1x or 1.5x, etc that you usually see in a macro patent.

It could be that Canon is looking at doing all the cheaper RF primes as being 1:2 macro similar to the Canon RF 35mm F1.8.

From the patent application;

It is an object of the present invention to provide an optical system having a small overall size, a large maximum imaging magnification, and high optical performance over the entire object distance, and an imaging apparatus having the same.

Both of them would have welcomed on the RF mount.

First up the Canon RF 85mm F1.8

Focal length         84.05  
F-Number              1.86  
Half angle (degrees) 14.44  
Image height         21.64  
Full length         100.02  
BF                   14.64

Canon RF 100mm F2.8

Focal Length        101.03  
F-Number              2.88  
half angle (degrees) 12.09  
image height         21.64  
Full length         130.45  
BF                   18.70  

Next is the Canon 100mm F2.0.  Interestingly, this is APS-C.  Could the EOS-M be getting a longer prime?

Focal length         96.24  
F Number              2.06  
half angle (degree)   8.08  
Image height         13.66  
Full length         115.28  
BF                   14.96

Canon Patent Application 2020-052118

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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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