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Canon Patent Application: Some odd DO telephotos
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Canon Patent Application: Some odd DO telephotos

These have to be some of the strangest lens designs I've seen.  These are obviously experimental in nature.  But they are some very simplistic (and very slow) supertelephoto lenses using DO elements.

They are looking for in this patent application; 

 a good balance between reduction of change of the optical performance caused by an object distance and downsizing and weight reduction of the optical system.

The lens characteristics are;

Focal Length 780.00
F-Number 11.00
Half Field Angle 1.59 (.degree.)
Image Height 21.64
Total Length of 389.25
Lens BF 127.73

Focal Length 585.00
F-Number 10.99
Half Field Angle 2.12 (.degree.)
Image Height 21.64
Total Length of 334.87
Lens BF 134.40 

Focal Length 390.00
F-Number 8.20
Half Field Angle 3.18 (.degree.)
Image Height 21.64
Total Length of 250.00
Lens BF 92.99

US Patent Application 20190346660

 

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