A patent for an EF 28-200mm f/3.5-5.6 optical formula has been published.
Patent Publication No. 2015-172612 (Google Translated)
- Published 2015.10.1
- Filing date 2014.3.11
- Zoom ratio 6.68
- Focal length 28.90 51.17 193.10
- F-number 3.63 4.39 5.88
- Half angle (in degrees) 36.82 22.92 6.39
- Image height 21.64 21.64 21.64
- Overall length of the lens 132.70 149.90 182.70
- BF 39.40 49.73 66.13
We're not sure what the point of this one is, but a future patent may shed some light on the subject.
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