Patent: EF-M 70-400 f/4.5-7.2 STM

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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