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Canon Patent New High Speed AF EF-EF-M Adapter

Canon-EF-M-adapter-img

Canon Patent New High Speed AF EF-EF-M Adapter for EOS M mirrorless camera, as we all know that the Hybrid AF Sensor (phase+contrast based AF system) of the EOS M series camera work very well with the EOS-M native lenses aka EF-M mount lenses, but when EF or EF-S Lenses are mounted on EOS M series mirrorless via currently available adapter, we see slow and sluggish AF speed… to overcome this Canon patented High Speed AF EF-EF-M Adapter that will improve the AF speed while using the EF and EF-S Lenses.

Explanation self interpretation of patent literature

  • Patent Publication No. 2015-34903
    • Published 2015.2.19
    • Filing date 2013.8.9
  • Master lens
    • Zoom ratio 2.69
    • Focal length 72.13 135.02 193.99mm
    • Fno. 2.90
    • Half angle ω = 10.72 5.78 4.03 °
    • Image height Y = 13.66mm
    • Overall length of the lens 237.36mm
    • BF 54.00mm
  • Adapter installed
    • Zoom ratio 2.69
    • The focal length f = 72.12 135.00 193.96mm
    • Fno. 2.90
    • Half angle ω = 10.72 5.78 4.03 °
    • Image height Y = 13.66mm
    • Overall length of the lens 239.70mm
    • BF 16.77mm
  • Canon patent
    • Fast AF adapter
    • Wobbling corresponding
    • 3-group configuration of positive and negative positive
    • 2 group also serves as a focus group and the anti-vibration group
    • And realize high-speed AF focus group was lighter

See more Canon Patents

via – egami.blog.so-net.ne.jp

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