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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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