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A new patent for an EF 100-400 f/4.5-5.6 STM has appeared. Also in the patent is the EF-S 55-250 f/4-5.6 IS STM, so this patent is probably just covering an additional optical formula that will not become a product. I'd think any 100-400 replacement will be an L lens with an Ultrasonic Motor instead of an STM.
- 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 ω = 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 ω = 11.69-6.17-3.18 °
- Image height 21.64mm
- 245.09-285.06-308.91mm overall length of the lens
- BF 68.73mm
Source: [EG]
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