Canon patent for an optical formula that appears to be for a 1″ sensor, and for a 28-500mm F2.8-4 lens. Canon makes Powershot cameras with an 1″ sensor, the patent may point to a future super-zoom Powershot camera.

• Patent Publication No. 2016-99548
  • Published 2016.5.30
  • Filing date 2014.11.25
• Example 1
  • Zoom ratio 17.50
  • Focal length 9.76 104.00 170.79
  • F-number 2.88 3.77 3.90
  • Half angle of view (degrees) 36.48 4.51 2.75
  • The image height 7.22 8.20 8.20
  • The total lens length 196.17 196.17 196.17
  • BF 7.33 7.33 7.33

[via Egami]