Canon patents for 600mm f/4 and 400mm f/2.8 lenses

By PR admin | Published: May 23, 2012

Canon filed a patent (2012-88427) in Japan for 600mm f/4 and 400mm f/2.8 lenses:

  • Patent release date: May 10, 2012
  • Patent filed on October 18, 2010
  • 600mm f/4 lens:
    • Focal length: 585.00mm
    • Aperture: 4.12
    • Image height: 21.64mm
    • Lens length: 468.50mm
    • Back focus: 90.78mm
    • Lens design: 15 elements in 9 groups, one aspherical element,  two UD elements
  • 400mm f/2.8 lens:
    • Focal length f = 391.86mm
    • Aperture: 2.88
    • Image height: 21.64mm
    • Lens length: 367.51mm
    • Back focus: 50.01mm
    • Lens design: 14 elements in 9 groups, two aspherical elements, one UD element

Related posts:

  1. The latest patents from Olympus and Canon
  2. The latest patents from Canon, Panasonic and Pentax
  3. Canon files a patent for a 600mm f/5.6 lens
  4. Panasonic 12-60mm f/4.5-5.6 and Olympus 150mm f/2.8 lens patent
  5. Sony 50mm f/1.2 and f/1.4 lens patents

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  • RinseAndRepeat

    *Yawn* Just another re-hash of the current models so Canon can justify a price bump.

    Canon shooters better stock up on Preparation H…pricing for these new lenses is gonna HURT!

    • http://www.flickr.com/genotypewriter genotypewriter

      There must be a lot of bliss in your world

  • nonac
    • http://photo.stackexchange.com/users/4506 DragonLord

      Agreed. Notice that the diagrams each include a label to one of the lens elements that says “DOE”–diffractive optical element.

      • Ben

        about time canon uses more diffractive optics. lenses have been standing still for too long.

        • http://www.flickr.com/genotypewriter genotypewriter

          Sure they can make DO lenses a little bit shorter than non-DO lenses but practically they hardly make any difference and there aren’t even proper bragging rights associated with them since non-DO lenses produce better quality images.

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