Sony Filed Patent for 60mm f/2 Lens

Egami, the Japanese Photography Blog has discovered a new patent filed by Sony. The new Sony patent describes a new 60mm f/2 prime lens.

At the same focal length Sigma and Tamron has lenses for several camera mounts. This lens may also be a new lens for the new Sony A7r full frame mirrorless camera.

Sony 60mm f/2 Lens Patent

Description and self-interpretation of the patent literature

• Patent Publication No. 2013-238740
  • Publication date 2013.11.28
  • Filing date 2012.5.15
• Example 1
  • Focal length f = 1.00mm
  • Fno. 2.0
  • Half angle ω = 19.62 °
  • 4 group 6 lens configuration
  • Three 5-sided aspherical
  • One ED glass
  • 35mm equivalent 60mm
• Example 2
  • Focal length f = 1.00mm
  • Fno. 2.85
  • Half angle ω = 23.31 °
  • 4 group 6 lens configuration
  • Three 5-sided aspherical
  • One ED glass
  • 35mm equivalent 50mm
• Seishibo negative-positive
• Inner focus
  • The weight of the focus group
  • Fast AF
  • Video support
• Increase the exit pupil distance by the third lens unit

via EG