Canon Patent for 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender

Canon filed a new patent for 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender. Canon patent application 2022-22771 discusses optical formulas for RF mount mirrorless cameras. First of all the lenses ;

  • 400mm f/4 DO IS Extender 1.4x
  • 600mm f/4 IS Extender 1.4x

See the details of the 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender below.

Example 1

  • Focal length: 392.58
  • F value: 4.12
  • Half angle of view: 3.15
  • Image height: 21.64
  • Overall length: 280.33
  • Back focus: 36.01

Example 1 (with inserted teleconverter)

  • Focal length: 549.72
  • F value: 5.77
  • Half angle of view: 2.25
  • Image height: 21.64
  • Overall length: 280.33
  • Back focus: 36.00

Example 5

  • Focal length: 585.00
  • F value: 4.12
  • Half angle of view: 2.12
  • Image height: 21.64
  • Overall length: 467.45
  • Back focus: 55.50

Example 5 (with inserted teleconverter)

  • Focal length: 819.18
  • F value: 5.77
  • Half angle of view: 1.51
  • Image height: 21.64
  • Overall length: 467.45
  • Back focus: 55.50

The Canon patent application was spotted by asobinet.com.

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