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    Home»Canon Patents»Patent: Canon EF 2.0X TC With Diffractive Optics Element

    Patent: Canon EF 2.0X TC With Diffractive Optics Element

    By Canon RumorsOctober 19, 2014Updated:October 19, 2014No Comments1 Min Read Canon Patents
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    dotc - Patent: Canon EF 2.0X TC With Diffractive Optics Element

    A patent showing a 2x teleconverter with a diffractive optic element (DO) has surfaced. The 2.0x teleconverter could use a little length reduction, though I'm not sure if DO would reduce the size of the current TC all that much.

    Patent Publication No. 2014-145870 (Google Translated)

    • 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

    Source: [EG]

    cr

    TC 2.0 DO
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