Skip to content

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]
Back To Top

Notice

This website or its third-party tools use cookies, which are necessary to its functioning and required to achieve the purposes illustrated in the cookie policy. If you want to know more or withdraw your consent to all or some of the cookies, please refer to the cookie policy.
By closing this banner you agree to the use of cookies.