New Patent: Canon EF 400mm f/2.8L IS With Built-in 1.4x and 1.7x Extender

canon-ef-400mm-f2-8-l-patent

Canon has just filed a new patent for the Canon EF 400mm f2.8L IS lens with two stage built in extender.  This will give the lens a focal range of 400mm, 1.4x (560mm) & 1.7x (680mm).

Detail translated by Google:

  • Patent Publication No. 2016-191761
    • Published 2016.11.10
    • Filing date 2015.3.31
  • Example
    • Focal length 392.57
    • F-number 2.90
    • Angle of view 3.15
    • Image height  21.64
    • Overall length of the lens 371.15
    • BF  44.00
    • The first state magnification 1.40
    • The second state magnification 1.70

Source: EGAMI

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