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Sigma Patent 200mm F2 DG OS HSM Sports Lens and a TELE CONVERTER 1.4x, the 200mm ART lens is of Sports edition and features a F2 aperture range, a excellent companion to carry around for shooting sports of wildlife photography. However a patent tales roughly 2-3 years of time to convert itself into a real product.

Sigma also filed patent for 1.4X tele converter

Take a look at the translated text below

• 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
• [0058] Incidentally, the main lens used in the embodiments of the present invention is directed to an imaging optical system disclosed in Example 1 of JP 2008-145584. However, the main lens is not limited to this.
• [0059] In order to properly carry out the evaluation of the chromatic aberration in the examples were fitted a known glass types in Example 1 of Japanese Unexamined Patent Publication No. 2008-145584.

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source – bit.ly/20u4QU4