Canon Patents

Patent: Sigma 200mm f/2 DG OS USM & 1.4 Teleconverter

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It looks like Sigma is developing a competitor to one of my favourite Canon lenses, the EF 200mm f/2L IS. This is one of those lenses that once you try one, you never want to put it down. It’s a very versatile focal length and is especially magical for portrait work.

Patent Publication No. 2016-45314 (Google Translated)

  • Published 2016.4.4
  • Filing date 2014.8.21

Sigma 200mm f/2 DG OS

  • Focal length 194.93
  • F-number 2.05
  • Full angle of view 2ω 12.70
  • The image height Y 21.63
  • Overall length of the lens 231.33
  • BF 60.2233

Sigma 1.4x TC

  • Focal length 274.52
  • F-number 2.89
  • Full angle of view 2ω 9.06
  • The image height Y 21.63
  • Overall length of the lens 252.18
  • BF 39.5088

Along with the optical formula patent for a 200mm f/2 OS, it looks like Sigma is developing a dedicated 1.4x teleconverter for the lens.

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