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Tamron Patent for FE 90mm f/2.8 Macro Lens for Sony E-mount

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Tamron has filed a patent for a new macro lens in Japan. The new patent describes the Tamron FE 90mm f/2.8 lens designed for Sony mirrorless cameras with full-frame image sensors.

Along with the FE 90mm f/2.8 Macro, Tamron has filed several new lens patents for Sony Full Frame mirrorless cameras. Pending patents are 120mm f/2.8, 60mm f/2.8, 180mm f/2.8, 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.

When it becomes available in the market, the Tamron FE 90mm f/2.8 Macro full frame e-mount lens will sure be a cheaper alternative when compared to the Sony FE 90mm f/2.8 G OSS lens.

Tamron FE 90mm f/2.8 Full Frame Mirrorless Lens Details

tamron-fe-90mm-f2-8-macro-lens-patent

Explanation self interpretation of patent literature

  • Patent Publication No. 2015-75508
    • Published 2015.4.20
    • Filing date 2013.10.7
  • Example
    embodiment
    Example Focal distance Fno. Half angle Shooting magnification
    One 92.742 67.284 43.796 2.880 4.325 5.770 12.654 ∞ -0.5 -1.0
    Two 116.425 85.947 55.216 2.880 4.325 5.770 10.221 ∞ -0.5 -1.0
    Three 61.833 56.303 42.747 2.880 4.325 5.770 19.343 ∞ -0.5 -1.0
    Four 174.569 102.029 63.465 2.880 4.325 5.770 6.842 ∞ -0.5 -1.0
    Five 290.995 150.108 92.448 2.880 4.325 5.770 4.176 ∞ -0.5 -1.0

    Image height Y = 21.633mm

  • Tamron patent
    • 3-group configuration of positive and negative positive
    • Inner focus (the second group)

via: EG