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Canon patent for EF 20-45mm f/2.8-4 Lens

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Canon filed a new patent in Japan. The new patent describes the EF 20-45mm f/2.8-4 lens which looks like to be a new kit lens for full-frame sensor Canon DSLRs.

Canon’s current patent shows a EF 20-45mm f/2.8-4 lens which provides f/2.8 maximum aperture at 20mm focal length and f/4 at 40mm. If becomes in mass production the lens looks like a budget-friendly kit lens for Canon full frame bodies.

Here are the patent details below.

Canon EF 20-45mm f/2.8-4 Lens Patent


Patent details translated by Google:

  • Patent Publication No. 2015-197593
  • Published 2015.11.9
  • Filing date 2014.4.1
  • Example Zoom ratio 2.25
  • Focal length f = 20.00 23.60 45.00
  • Fno. 2.75 2.90 4.16
  • Half angle of 47.25 42.51 25.68
  • Image height 21.64 21.64 21.64
  • Overall length 158.28 156.32 173.36
  • BF 42.05 46.10 73.14

via: EG

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