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[Patent] Canon Files Patent For 14mm f/2.8 Lens (better coating, low refractive index)

14mm f/2.8

Egami (translated) spotted another patent filed by Canon. This time it is for a 14mm f/2.8 lens with improved coating (tubular coating):

It seems it is possible to realize a low-refractive-index low reflectivity by the structure below the diffraction limit, even without the uneven surface of the coating. 14mm F2.8 is what I want you to adopt all means patent coating of the lens as the front lens is large, yet is protruding.

Cross-sectional view

  • Patent Publication No. 2012-159723
    • 2012.8.23 Release Date
    • 2011.2.1 filing date
  • Example 1
    • F = 14.3mm focal length
    • Fno. = 2.89
    • Half angle ω = 56.6 °
    • 14 images in 10 groups lens configuration
  • Existing coating roughness
    • In daily use, dirt or dust may adhere, could not wipe, sex or bad Mentenasu productivity and manufacturing process
  • Canon patent
    • (Coating applied to one surface of a lens) thin film layer
    • Having a plurality of tubular spaces are arranged parallel to the tube
    • Maximum opening diameter of the tubular space below 400nm
    • The inorganic oxide materials (silica, titania)
[via Egami]
  • Hey There Canonwatch,
    On a similar note, Before commencing buying Canon lenses you’ll need to be informed about lens terminology. Some of the terminology is unique to Canon. Some other camera manufacturers have their own as well. Canon and Nikon are the more popular camera makes. There are 2 principal categories of lenses.. Prime lenses contain a fixed focal length. Zoom lenses have a variable focal length. The caliber of photos you desire and your budget determines the types of lenses you will buy.
    Kindest Regards

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