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New Patent: Canon EF 28-560mm f/2.8-5.6 Lens

The Current Canon EF 28-300 f/3.5-5.6L IS USM Lens

Canon has filed a new patent for the EF 28-560mm f/2.8-5.6 lens. This is a 20x optical formula super zoom lens designed for Canon full frame DSLRs. A few months ago Canon was allegedly working on the successor to the current EF 28-300 f/3.5-5.6L IS lens. And this EF 28-560mm f/2.8-5.6 lens should be the replacement for the EF 28-300 f/3.5-5.6L IS lens.

Take a look at the patent details below translated by Google.

Patent Publication No. 2016-80973

  • Published 2016.5.16
  • Filing date 2014.10.21

Example 1

  • Zoom ratio 18.78
  • Focal length 28.80 139.49 540.91
  • F-number 2.88 4.77 5.88
  • Half angle of view (degrees) 36.91 8.82 2.29
  • Image height 21.64
  • The total lens length 298.13 341.13 398.13
  • BF 44.99 76.94 116.58
  • Close range 700mm
  • The effective diameter of the front lens 109.04mm
  • Lens configuration 15 group 21 sheets
  • Aspherical surface 7 five
  • UD 1 sheet
  • Positive and negative grain positive and negative polarity of the 6-group zoom
  • Inner focus (1 part of Group 3)

via: Egami

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Related posts:

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