Canon Patents

Patent: Canon EF-S 9-20mm F4.5-5.6 IS

A patent showing an optical formula for a Canon EF-S 9-20mm F4.5-5.6 IS has appeared. I would assume this was part of the development for the EF-S 10-18mm f/4.5-5.6 IS and that there isn’t another wide angle zoom coming for APS-C.

Patent Publication No. 2015-31869 (Google Translated):

  • Published 2015.2.16
  • Filing date 2013.8.5
  • Zoom ratio 2.07
  • Focal length 9.50 14.52 19.70
  • F-number 4.64 5.21 5.80
  • Half angle (in degrees) 55.17 43.26 34.74
  • Image height 13.66
  • Overall length of the lens 143.95 134.71 134.11
  • BF 38.00 47.58 56.42

Canon EF-S 10-18 f/4.5-5.6 IS STM $299: Amazon | B&H Photo | Adorama

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