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We expect to see an RF 70-200mm f/2.8L IS USM announced some time in 2019 as part of the “holy trinity” of f/2.8 zoom lenses for Canon’s EOS R system.
Here’s the first patent for such an optical formula uncovered by Canon News.
US Patent Application 20190004296
- Focal length: 72.00 135.00 194.99
- F-number: 2.92 2.92 2.92
- Half angle of view (deg.): 16.73 9.10 6.33
- Image height: 21.64 21.64 21.64
- Length of the zoom lens : 172.73 227.50 242.86
- BF: 14.38 26.45 39.44
- Via: Canon News
- Source: USPTO