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Canon Patent Application: Variety of lenses discussed
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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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