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

EF-S 55-200mm

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 EF-M 55-200mm IS STM lens for the EOS M system.

Hard to say if this patent will ever hit the market. A similar telephoto lens for EF-S mount exists, the similar specced EF-S 55-250mm f/4-5.6 IS STM. 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
[via Egami]
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