According to the Egami blog, Canon has filed a patent for a CN-E 60-800mm f/4-5.6 optical formula.
Patent Details
- Patent Publication No. 2016-173529
- Published 2016.9.29
- Filed 2015.3.18
- Zoom ratio 13.33
- Focus distance 60.00 300.00 800.00
- F-number 4.00 4.00 5.60
- Field of view (degrees) 14.53 2.97 1.11
- The total lens length 465.36 465.36 465.36