Tamron Patents for 30mm f/2.8 Macro, 28mm f/2.5 Macro Lenses

Egami has discovered new patents filed by Tamron in Japan. The new patents describes two new Tamron 30mm f/2.8 Macro and Tamron 28mm f/2.5 macro lenses for APS-C cameras.

Tamron currently has the widely popular SP 90MM F/2.8 DI MACRO 1:1 VC USD macro lens in their Di lenses lineup. Both of these lenses has shorter focus lengths 30mm is equivalent to 45mm and 28mm is equivalent to 42mm.  We expect these Tamron macro lenses will be cheaper macro models.

Tamron Patents for 30mm f/2.8 Macro, 28mm f/2.5 Macro Lenses

• 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