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Canon Patent Application: High Zoom Ratio lenses for EF and RF
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Canon Patent Application: High Zoom Ratio lenses for EF and RF

This patent application contains embodiments for high zoom ratio lenses.  Most of them are for EF mount, with large registration distances that are associated with the EF mount.  However, there is two RF mount lens embodiments that slips in with 22.42 and 21.75mm back focus.

Focal distance      35.04 152.85 350.37 
F number             3.50   4.97   5.60 
Field angle         30.36   8.05   3.53 
Image height        20.53  21.61  21.61 
length of the lens 321.17 321.17 321.17 
BF                  40.10  40.10  40.10 

Focal distance      35.04 152.85 350.37 
F number             3.50   4.97   5.60 
Field angle         30.36   8.05   3.53 
Image height        20.53  21.61  21.61 
length of the lens 321.17 321.17 321.17 
BF                  40.10  40.10  40.10 

Focal distance      35.13 160.38 386.45 
F number             4.50   5.27   5.60 
Field angle         30.30   7.67   3.20 
Image height        20.53  21.61  21.61 
length of the lens 362.82 362.82 362.82 
BF                  54.68  54.68 54.68 

Focal distance      29.22 203.97 350.06 
F number             2.80   4.36   4.50 
Field angle         32.15   6.05   3.53 
Image height        18.36  21.61  21.61 
length of the lens 406.68 406.68 406.68 
BF                  22.42  22.42  22.42 

Focal distance      25.20 125.05 294.41 
F number             3.50   4.97   5.60 
Field angle         36.72   9.80   4.20 
Image height        18.80  21.61  21.61 
length of the lens 374.08 374.08 374.08 
BF                  21.75  21.75  21.75 

Japan Patent Application 2018-180203

 

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