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Canon Patent Application: Kit lenses RF/EF-S
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Canon Patent Application: Kit lenses RF/EF-S

Seems Canon is still looking at ways to improve kit lenses, again, looking for ways to make them small and lightweight.  Even though Canon doesn't say specifically in these diagrams, there are some huge air gaps between the elements, making me wonder if they are also not looking at making it more collapsible.

There are some interesting lenses for the RF mount that make this patent application, and some EF-S Kit lenses for EF mount depending on the back focus distance.

Canon RF 20-85mm F3.5-5.6

focal length 20.61 43.52 83.00
F number 3.65 5.60 5.80
Half angle of view (degrees) 42.52 25.76 14.61
Image height 18.90 21.00 21.64
Total lens length 144.78 134.16 149.20
BF 9.10 34.75 70.08

Canon EF-S 18-55mm F3.5-F5.6

focal length 18.60 34.00 53.35
F-number 3.63 5.88 5.88
Half field angle (degrees) 36.29 21.89 14.36
Image height 13.66 13.66 13.66
Total lens length 130.32 116.40 123.98
BF 38.39 55.11 76.11

Canon EF-S 18-55mm F3.5-F5.6

focal length 18.60 36.00 53.35
F-number 3.63 5.88 5.88
Half angle of view (degrees) 36.29 20.78 14.36
Image height 13.66 13.66 13.66
Total lens length 140.83 116.87 120.00
BF 38.56 56.39 73.67

Canon RF 24-70mm F3.5-5.6

focal length 24.70 42.24 68.00
F-number 3.65 5.60 5.80
Half angle of view (degrees) 37.42 26.43 17.65
Image height 18.90 21.00 21.64
Total lens length 149.70 126.15 127.97
BF 27.45 31.48 47.40

Japan Patent Application 2019-207291


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