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

Tamron has filed several new super telephoto prime lenses in Japan. These lens patents are Tamron 300mm f/2.8 Lens, Tamron 400mm f/4 Lens, Tamron 500mm f/4 Lens.

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