The Japanese blog, Egami has uncovered a new Canon patent for an EF 100-400mm f/4.5-5.6 STM lens. The same patent covers the EF-S 55-250mm f/4-5.6 IS STM lens as well. The highly anticipated announcement of the EF 100-400mm f/4.5-5.6L IS II lens, with the Ultrasonic motor instead of STM, may come in the first week of September.
Patent Publication No. 2014-102462
- Publication date 2014.6.5
- Filing date 2012.11.22
Example 1
- Zoom ratio 4.24
- Focal length f = 56.90-133.00-241.28mm
- Fno. 4.12-5.04-5.83
- Half angle ? = 13.50-5.86-3.24 °
- Image height 13.66mm
- 154.33-176.38-191.20mm overall length of the lens
- BF 41.21mm
Example 5
- Zoom ratio 3.73
- Focal length f = 104.59-199.99-389.99mm
- Fno. 4.58-5.03-5.87
- Half angle ? = 11.69-6.17-3.18 °
- Image height 21.64mm
- 245.09-285.06-308.91mm overall length of the lens
- BF 68.73mm
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