Tamron new Patents: 30mm f/2.8 Macro, 28mm f/2.5 Macro

Tamron macro lens patents

Tamron filed two new macro lens patents in Japan for APS-C cameras. These are Tamron 30mm f/2.8 Macro and Tamron 28mm f/2.5 Macro.

  • Patent Publication No. 2014-21341
    • Publication date 2014.2.3
    • Filing date 2012.7.19
  • Example 1
    • Focal length f = 27.49mm
    • Fno. 2.60
    • Angle of view 2ω = 55.11 °
    • β = Inf – 1.0
    • 10 pieces of 8-group lens configuration
    • Four 7 sided aspherical
  • Example 3
    • Focal length f = 29.98mm
    • Fno. 2.88
    • Angle of view 2ω = 50.69 °
    • β = Inf – 1.0
    • 10 pieces of 8-group lens configuration
    • Four 7 sided aspherical
  • Tamron patents
    • Three-group structure of the positive and negative positive
    • Inner focus
      • Single lens of a portion of the second group
      • AF speed diameter, so small and light

via: EG