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Canon Patent Application: Mirrorless kit lenses
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Canon Patent Application: Mirrorless kit lenses

This patent application demonstrates several different kit lenses for full frame and also a couple of APS-C 18-55 models.  With the variable apeture and less complicated element arrangement, these are certainly looking to be low cost lenses.  Also the full frame lenses have a smaller image circle at the wide end, meaning, there's post processing that occurs to stretch the image out to the full size of the sensor.

The lens designs are;

  • Full Frame 24-70 F3.6-F5.6
  • Full Frame 20-85mm F3.6-F5.6
  • APS-C 18-55 F3.6-F5.6

From the patent application;

Zoom ratio: 4.03
focal length 20.61 43.52 83.00
F-number 3.65 5.60 5.80
half angle of field 42.52 25.76 14.61
(degree) image height 18.90 21.00 21.64
overall lens length 144.78 134.16 149.20 
BF 9.10 34.75 70.08

Zoom ratio: 2.87
focal length 18.60 34.00 53.35
F-number 3.63 5.88 5.88
half angle of field (degree) 36.29 21.89 14.36
image height 13.66 13.66 13.66
overall lens length 130.32 116.40 123.98 
BF 38.39 55.11 76.11

focal length 24.70 42.24 68.00
F-number 3.65 5.60 5.80
half angle of field 37.42 26.43 17.65
(degree) image height 18.90 21.00 21.64
overall lens length 149.70 126.15 127.97 
BF 27.45 31.48 47.40

US Patent Application 20190364216


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