Patents: Canon RF 200-400mm F4 Extender 1.4x & 200-500mm F4 Extender 1.4x Lenses

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Canon has filed two RF-mount telephoto lenses with extender patents: 200-400mm F4 Extender 1.4x and 200-500mm F4 Extender 1.4x Lenses.

[Publication number] P2022185663
[Publication date] December 15, 2022
[Patent application title] Zoom lens and imaging device

Example 1 (200-400mm F4)

  • Focal length: 205.1-385.5
  • F-value: 4.1
  • Half angle of view: 5.99-3.21
  • Image height: 21.635
  • Total length: 367.62
  • Back focus: 39.994

Example 1-2 (when using 200-400mm F4 1.4x teleconverter)

  • Focal length: 290.4-543.2
  • F-value: 5.8
  • Half angle of view: 4.26-2.28
  • Image height: 21.635
  • Total length: 367.62
  • Back focus: 39.994

Example 4 (200-500mm F4)

  • Focal length: 207.0-487.9
  • F-value: 4.1
  • Half angle of view: 5.97-2.54
  • Image height: 21.635
  • Overall length: 410.05
  • Back focus: 39.998

Example 4-2 (200-500mm F4 1.4X teleconverter)

  • Focal Length: 288.1-678.9
  • F-value: 5.7
  • Half angle of view: 4.30-1.83
  • Image height: 21.635
  • Overall length: 410.05
  • Back focus: 39.998

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