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A patent for a new supertelephoto zoom optical formula for the EOS M system has surfaced in the form of an EF-M 70-400 f/4.5-7.2 STM.
- Patent Publication No. 2014-228734 (Google Translated)
- Published 2014.12.8
- Filing date 2013.5.23
- Example 3
- Zoom ratio 5.58
- The focal length f = 69.59-251.52-388.00mm
- Fno. 4.68-6.30-7.00
- Half angle ω = 11.11-3.11-2.02 °
- Image height 13.66mm
- Overall length of the lens 155.01-227.97-240.02mm
- BF 15.81-37.15-46.87mm
- Inner focus
Source: [EG]
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