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Saturday, January 6, 2018

Tamron Patents - 300mm f/4, 400mm f/4, 500mm f/4 Lens

Tamron is the lesser known third party lens manufacturer in addition to Sigma. They are trying to enter the Super Telephoto lens market by coming out with their version of the big white Canon 'L' lens.

Three different optical formulas have been uncovered in the same patent application from Tamron. I have never been enamored of Tamron lenses but am willing to take a look at these glasses when they come to market.

I am waiting for the Canon EF 600mm f/4 DO BR lens to be announced this year. I own the EF 400mm f/4 DO IS II lens but it is a bit short sometimes with a full frame camera like the EOS-1D X Mark II and a 600mm f/4 will fit my needs perfectly. I will be off on an East Africa wildlife photo shoot very soon. You can follow my travels on Facebook  and Twitter , see my equipment bag and works on

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

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