Canon patent for EF-S 55-200mm f/4-6.3 STM lens

Canon patent for an EF-S 55-200mm f/4-6.3 STM lens. No mention of IS in the patent, that’s weird. For the time being there is an [shoplink 21207]EF-M 55-200mm IS STM[/shoplink] lens for the [shoplink 6091]EOS M[/shoplink] system.

Hard to say if this patent will ever hit the market. A similar telephoto lens for EF-S mount exists, the similar specced [shoplink 36142]EF-S 55-250mm f/4-5.6 IS STM[/shoplink]. Note that the optical formula in the Canon patent mentions an f/6.3 max aperture at telephoto lens. Could be another kit lens option, or just one of the many patents filed by Canon.

• Patent Publication No. 2015-197655
  • Published 2015.11.9
  • Filing date 2014.4.3
• Example 1
  • Zoom ratio 3.68
  • Focal length 54.36 133.00 199.99
  • F-number 4.14 5.22 6.32
  • Half angle of 14.11 5.86 3.91
  • Image height 13.66
  • Overall length of the lens 129.39 161.77 167.04
  • BF 46.78 66.90 78.18