Tamron Patent for 28mm, 50mm and 60mm f/2.8 Lenses for Sony FE-mount

Tamron has filed a patent for a several new prime lenses in Japan. The new patent describes the Tamron SP 28mm f/2.8 VC, SP 50mm f/2.8 VC and SP 60mm f/2.8 VC lenses designed for Sony mirrorless cameras with full-frame image sensors.

As we’ve posted earlier, the company has pending patents filed like the FE 90mm f/2.8 Macro, 120mm f/2.8, 180mm f/2.8, and 300mm f/2.8 lenses.

This would be good news for the current Sony A7-series FE-mount users. As Tamron produce such good lenses with an affordable price.

Tamron 28mm, 50mm and 60mm f/2.8 Full Frame Mirrorless Lens Details

According to patent application all three lenses will have in lens stabilization featuring 6 group and 7 lens design. They will also have a close focusing distance of 30cm.

tamron-patent-for-28mm-50mm-and-60mm-f2-8-lenses-for-sony-fe-mount

Description, self-interpretation of the patent literature

  • Patent Publication No. 2015-163926
    • Published 2015.9.10
    • Filing date 2014.2.28
  • Example
    embodiment
    Example Focal length Fno. Half angle Image height BF Minimum focusing distance Lens constitution Aspheric surface LD
    1 27.5462 26.0246 2.8840 2.8985 38.5881 38.3233 20.29 21.07 15.6482 15.6482 300 6 groups seven 6 surface 3 sheets 0
    2 48.4962 40.8401 2.8840 2.9589 21.9113 20.7990 21.63 21.63 16.1817 16.1817 300 6 groups seven 6 surface 3 sheets 1
    Three 58.5031 46.1351 2.8840 3.0166 18.4621 17.3034 21.63 21.63 20.1130 20.1130 300 6-group, six 6 surface 3 sheets Three
  • Tamron patent
    • Of positive and negative negative 3-group configuration
    • Inner focus (the second group)
    • Vibration control
    • Video support

via Egami