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 MichaelDanielHo.com
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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