Patents: Tamron 300mm f/2.8, 400mm f/4 and 500mm f/4 Lenses

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It seems that Tamron is working on several fast super telephoto prime lenses. Recently Tamron has filed three new patents for Tamron 300mm f/2.8, 400mm f/4 and 500mm f/4 lenses, which are designed for a 35mm full-frame sensor. Take a look at the patent details below:

Embodiment 1: 300mm F/2.8

  • Focal length: 304.799 mm
  • F No.: 2.8
  • ω: 3.997
  • Image height: 21.64 mm
  • Back focus: 70.1919 mm
  • Lens length: 298.38 mm

Embodiment 2: 400mm F/4

  • Focal length: 396.296 mm
  • F No.: 4.0
  • ω: 2.963
  • Image height: 21.64 mm
  • Back focus: 102.3549 mm
  • Lens length: 332.36 mm

Embodiment 3: 500mm F/4

  • Focal length: 485.045 mm
  • F No.: 4.001
  • ω: 2.530
  • Image height: 21.64 mm
  • Back focus: 125.2621 mm
  • Lens length: 420.001 mm

Via: so-net