New Patent: Canon EF 20-45mm F2.8-4 Lens

Canon EF 20-45mm F2.8-4 lens patent

Canon has just filed a new lens patent for EF 20-45mm F/2.8-4 lens. This is another new wide-angle zoom lens for Canon DSLRs.

Detail translated by Google:

  • Patent Publication No. 2015-197553
    • Published 2015.11.9
    • Filing date 2014.4.1
  • Example
    • Zoom ratio 2.25
    • Focal length 20.00 23.60 45.00
    • F-number  2.75 2.90 4.16
    • Half angle (in degrees)  47.25 42.51 25.68
    • Image height 21.64 21.64 21.64
    • Overall length of the lens 158.28 156.32 173.36
    • BF 42.05 46.10 73.14

Source: EG

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