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Canon Patent for External Image Stabilisation Unit

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Egami (translated) spotted a patent filed by Canon for an external image stabilisation unit. The unit is placed between the camera body and the lens, just like you would do with a teleconverter. Cool invention!

The present invention, users vibration reduction function or lighter or selectable according to the application, in addition to being used as an optical system having a vibration reduction converter, an optical system having a vibration reduction function, a vibration reduction function can also be used as a commercial advantage that the two systems can be Heibai by diverting a large portion of the component with no lightweight optics.

  • Patent Publication No. 2015-28555
    • Published 2015.2.12
    • Filing date 2013.7.30
  • Example 1a (master lens only)
    • Focal length 392.50
    • F-number 2.92
    • Half angle of 3.16
    • Image height 21.64
    • Overall length of the lens 379.64
    • BF 41.57
    • Effective diameter of the front lens 135.72mm
    • Lens configuration 8 groups nine
  • Example 1b (anti-vibration converter mounted state)
    • Focal length 392.50
    • F-number 2.92
    • Half angle of 3.16
    • Image height 21.64
    • Overall length of the lens 379.64
    • BF 41.56
    • Effective diameter of the front lens 135.72mm
    • Lens construction 12 groups 15 sheets
  • Canon patent
    • 3-group configuration of positive and negative positive
    • Inner focus (the second group)
    • The anti-vibration converter can be inserted on the object side of the third group
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