Tamron Patent for 18-105mm f/4-5.6 Di III VC Mirrorless Lens

Egami has discovered a new patent filed by Tamron in Japan. The new patent describes the Tamron 18-105mm f/4-5.6 Di III VC lens for mirrorless cameras with APS-C-sized image sensors.

According to the name the zoom lens features Vibration Compensation (VC) technology. It also has the “Di III” designation, which means that it has been created for mirrorless cameras.

If the Tamron 18-105mm f/4-5.6 Di III VC lens  becomes official, it will provide a focal length range of 18-105mm and a maximum aperture of f/4-5.6. See the patent details below.

Tamron 18-105mm f/4-5.6 Di III VC Lens Patent for Mirrorless Cameras

tamron-18-105mm-f4-5.6-di-iii-vc-lens-patent

Explanation self interpretation of patent literature

  • Patent Publication No. 2014-228812
    • Published 2014.12.8
    • Filing date 2013.5.24
  • Example 1
    • Fno. = 4.08-5.35-5.77
    • The focal length f = 18.38-43.53-102.92mm
    • Half angle ω = 39.04-17.51-7.5 °
    • Lens construction 12 group 16 sheets
    • Aspherical 5-sided three
    • LD 1
  • Example 2
    • Fno. = 4.08-5.35-5.77
    • The focal length f = 18.37-43.54-102.85mm
    • Half angle ω = 39.29-17.73-7.60 °
    • Lens construction 12 group 16 sheets
    • Aspherical 5-sided three
    • LD 2
  • Example 3
    • Fno. = 3.60-5.11-5.80
    • The focal length f = 24.75-54.97-116.31mm
    • Half angle ω = 42.09-20.87-10.18 °
    • Lens construction 12 group 16 sheets
    • Aspherical 7 surface 4 sheets
    • LD 2
  • Example 4
    • Fno. = 3.60-5.27-6.46
    • The focal length f = 28.88-90.03-290.84mm
    • Half angle ω = 38.16-13.09-4.17 °
    • Lens construction 12 groups 18 sheets
    • Aspherical six faces four
    • LD 2
    • XLD 1
  • Tamron patent
    • Positive and negative positive and negative negative 5-group zoom
    • Anti-vibration (third group)
    • Inner Focus (fourth group)

via Egami


  • C.B.

    It would be interesting to compare with Sony 18-105 for APSC E frame!