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Canon Patent Application: Variety of lenses discussed
This patent application deals with having the focus group small and light so that fast AF can be achieved. Also I would imagine this allows Canon to use cheaper focus systems if they choose to do so, versus the high torque USM motors.
The following lenses are shown in the embodiments.
Focal distance 36.10
F number 2.92
Half field angle 20.73
image height 13.66
Whole length 98.76
BF 35.46
Focal distance 18.56 48.87 145.41
F number 3.60 5.56 6.49
a half field angle -- 36.35 15.62 5.37
Image height 13.66 13.66 13.66
Whole length 103.26 118.62 145.33
BF 10.65 10.65 10.65
Focal distance 24.76 30.10 67.98
F number 2.92 2.92 2.91
a half field angle -- 41.15 35.71 17.65
Image height 21.64 21.64 21.64
Whole length 198.84 183.00 165.88
BF 38.37 38.37 38.37
Focal distance 11.33 15.16 21.84
F number 4.10 4.65 5.72
a half field angle-- 50.33 42.03 32.02
Image height 13.66 13.66 13.66
Whole length 88.44 85.64 87.26
BF 9.00 14.02 22.72
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