Patent: Canon EF 300-600 f/5.6 w/1.4x TC

Patent: Canon EF 300-600 f/5.6 w/1.4x TC

Super telephoto patent
A new Canon patent showing other lens formulas using a built-in 1.4x teleconverter. Two of the primary lenses are an EF 300-600 f/5.6L IS 1.4x and a 600 f/4L IS with a built in TC.

The same patent also shows the EF 200-400 f/4L IS 1.4x TC. Perhaps Canon sees value in this setup for longer lenses? Here’s hoping so.

Example 2

  • Focal length f = 585.10mm
  • Fno. 4.12
  • Half angle ω = 2.12 °
  • Image height Y = 21.64mm
  • The overall length of the lens 467.32mm
  • BF 83.15mm
  • Teleconference insertion
  • Focal length f = 819.00mm
  • Fno. 5.77
  • Half angle ω = 1.51 °

Example 3

  • Zoom ratio 1.90
  • Focal length f = 307.50 – 585.00mm
  • Fno. 5.88
  • Half angle ω = 4.02 – 2.12 °
  • Image height Y = 21.64mm
  • The overall length of the lens 405.00mm
  • BF 75.70mm
  • Teleconference insertion
  • Focal length f = 427.00 – 812.33mm
  • Fno. 8.17
  • Half angle ω = 2.90 – 1.53 °

Source: [EG]

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