Canon patents new 300mm f/4 lens

Canon filed a patent in Japan for a new 300mm f/4 lens:

For comparison, here is the current Canon EF300mm F4L IS USM design (1997):

Patent details:

  • Patent Publication: 2011-27864
  • Release date: 02/10/ 2011
  • Filing date: 07/23/2009
  • Focal length: 294.00mm
  • Aperture: 4.14
  • Angle of view: 8.24°
  • Image circle: 43.28mm
  • Total lens length: 245.03mm
  • Back focus: 86.14mm

Via Egami

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