Canon Patents

Patent: Sigma 12mm f/2.8 optical formula

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It looks like Sigma is continuing to work on wide angle lenses for full frame cameras. A recent patent application shows an optical formula for a 12mm f/2.8 Art series lens for full frame cameras. Sigma 12mm f/2.8 Art Specifications:
  • Focal length: 12.42mm
  • F number: 2.93
  • Angle of view: 120.49
  • Image height: 21.63mm
  • Lens length: 169.4mm
Sigma doesn’t have any fear of making lenses with similar focal lengths and speeds, so it wouldn’t surprise me to see this patent actually become a product in the near future.