Sigma has just filed a new patent for Sigma 200mm f/2 DG OS HSM Sports lens and a TELE CONVERTER 1.4X. This is a third part telephoto zoom lens with a large F2 aperture. several years ago,  Canon and Nikon both released their own 200mm F2 lenses at the price of $5,699. This Sigma lens would be cost much cheaper!

• Patent Publication No. 2016-45314
  • Published 2016.4.4
  • Filing date 2014.8.21
• The master lens
  • 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
• Complex lens
  • 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

Source: EGI

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