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Canon Patent application: Lenses for APS-C compact cameras
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Canon Patent application: Lenses for APS-C compact cameras

 

This patent application has two lenses for compact cameras that are of APS-C in size. These would have to be compact cameras because the image circle at the wide end is not 13.66mm meaning some image stretching is occuring at the wide end.  This happens occassionally in the powershot cameras.

Lens embodiments mentioned are:

focal length  18.21 50.49 85.95 
F number       2.91  5.51  7.69 
angle of view 31.59 15.14  9.03 
image height  11.20 13.66 13.66 
lens length   72.62 82.25 93.33 
BF             3.86  3.86  3.86 

focal length  17.86 49.71 102.44 
F number       2.47  5.05   7.32 
angle of view 32.10 15.36   7.60 
image height  11.20 13.66  13.66 
length        62.60 73.89  86.71 
BF             3.94  3.94   3.94

Focal distance 15.21 52.83 102.65 
F number        1.85  4.20   6.00 
Field angle    36.19 14.50   7.58 
Image height   11.13 13.66  13.66 
length         83.84 101.55 121.52 
BF              3.81   3.81   3.81 
 

Japan Patent Application 2018-31935

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