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Canon Patent For 2x Teleconverter With Diffractive Optical Element

Canon PatentCanon Patent

Egami (translated) spotted a patent filed by Canon for a 2x teleconverter which incorporates a diffractive optical element.

  • Patent Publication No. 2014-145870
    • Published Date 2014.8.14
    • Filing date 2013.1.29
  • Example 1
    • Focal length -109.09mm
    • Magnification 2.00x
    • 4 group 9-lens configuration
    • One plane diffraction plane (the first group)
  • Master lens
    • Focal length f = 293.76mm
    • Fno. 2.91
    • Half angle ω = 4.21 °
    • Image height Y = 21.64mm
    • The overall length of the lens 275.41mm
    • BF 53.79mm
    • 15 sheets 11 groups lens configuration
    • Protective glass 1
    • Rear filter 1
    • UD 2
    • Fluorite 1
  • Canon patents
    • I and the diffraction plane cemented surface of the cemented lens closest to the object side
    • This arrangement can suppress the flare
[via Egami]
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