Canon Patent for External Image Stabilisation Unit

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