Sigma patents 18-50mm f/3.5-5.6 lens for mirrorless APS-C camera

Sigma filed a patent in Japan for a 18-50 f/3.5-5.6 lens for APS-C mirrorless camera. During the CP+ show in February, Sigma announced that they will start producing lenses for Micro Four Thirds and E-mount camera systems. They even showed a prototype of a 30mm f/2.8 lens for E-mount (Sony).

Details:

  • Patent# 2011-59293
  • Focal length: 18.5958 - 48.4678mm
  • Aperture: 3.4463 - 5.8200
  • Angle of view: 74.7842 - 30.1732 °
  • Back focus: 11.8343 - 36.5650mm
  • Four aspherical surfaces
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