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]

Behind-The-Scenes on Top TV Show ‘Homeland’ (why they use Canon cameras)

The cinematographers behind ‘Homeland’ reveal how Canon EOS-1D C and EOS 5D Mark III DSLRs and Cinema EF lenses have helped give the hit TV show its look. Video at CPN.

Ouch! Football Player Falls On Sideline And Destroys A Canon L Telephoto Lens

That’s what you might call bad luck. For the Photographer. The player landed on top of what looks to be either a Canon EF [shoplink 108]500mm f/4L[/shoplink] or an [shoplink 112]EF 400mm f/2.8L[/shoplink] lens mounted on a Canon [shoplink 4119]EOS-1D X[/shoplink]. The photographer is ok, the lens broken in 2 parts.

[via Photography Bay | video via FanSided GIF]

CW Readers Contest – Most Liked Pics Of The Week


Ruzdi Ekenheim, Canon 5D MarkIII, 50mm f/1.4, Angkor Wat, Cambodia

 

Here is the first round-up of the most liked reader pics of the week. How it works:

1) Submit your picture with a short description on Canon Watch’s Facebook page
2) If you want like and comment the pictures from other readers on the Photo Stream
3) A selection of the most liked pictures will be posted every Sunday here on Canon Watch

Show the world what you are able to do with a Canon camera!

 


Daryl O Masterson‎, Sunrise …Tower butte and Navajo Mountain Page Arizona

 


Diego Eidelman‎, Way to the first floor @ Buenos Aires, Canon 7D + EF-S 10-22mm, 10mm, f/7.1, 0.6″, ISO 100

 


Doug England‎, Sunrise at Halfway Log Dump, Bruce Peninsula National Park, Ontario, Canada – Canon 5DIII, Rokinon 14 f/2.8, 1/30 s @ f/16 ISO 200

 


Jaka Ivančič‎, Staring At The Sunet // Debeli Rtič, Slovenija // Canon 5D MK III + canon 17-40L F4 // ISO 100, f9.0, 30s.

 


Andre Yabiku‎, I leave the train just to shot this friendly old man, despite the rush of a big city he was calmly reading his daily. Shot with a 6D and 17-40 f4L.

More pictures after the break

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