Tamron filed patent 2012-208434 in Japan for a 150-600mm f/5-6.3 lens. Two different lens designs were described. Patent details:
- Patent release date: October 15, 2012
- Patent filing date: March 30, 2011
- Focal length: 152.3068-582.0002mm
- Aperture: 5.12-6.45
- Angle of view: 16.30-4.23°
- Lens design: 18 elements in 13 groups
- Internal focusing
- Vibration Compensation (VC) mechanism
The "biggest" lens in Tamron's lineup is currently the 200-500mm f/5-6.3 Di LD IF AF.