Tamron filed a patent in Japan for a 10mm f/2.8 fisheye lens:
- Focal length: 9.712mm
- Aperture: 2.85
- Half angle of view: 90.00°
- Lens design: 10 elements in 8 groups, two four-sided aspherical elements, three LD glass elements
- Internal focus
- Vibration control
- Video support
Here are few other lens designed filed in the patent:
