Nikon filed a patent application 20110116172 (Japan, US versions) for a 10-30mm f/3.3-5.6 and 7-13mm f/3.5-5.6 lenses:
Nikon 10-30mm f/3.3-5.6
Nikon 7-13mm f/3.5-5.6
Are those two lenses for Nikon’s mirrorless solution? Almost: the image height of both lenses is 7.96mm (sensor diagonal of 15.92mm) which suggests a crop factor of 2.8x. Previous patents and rumors indicated a crop factor of 2.5-2.6x based on a sensor with a diagonal of 17mm. Nikon is either obfuscating their patents or they have different mirrorless solutions in terms of sensor size (even though the difference is only about 1mm).
Patents details:
Nikon 10-30mm f/3.3-5.6
- Focal length: 10.30 – 29.10mm
- Aperture: 3.31 – 5.78
- Angle of view: 77.58 – 30.52 °
- Image height: 7.962mm
- Total lens length: 73.80 – 72.19mm
- Back focus: 18.7255 – 39.4394mm
- Zoom ratio: 2.825x
- 3 aspherical elements
Nikon 7-13mm f/3.5-5.6
- Focal length:6.90 – 12.61mm
- Aperture: 3.62 – 5.77
- Angle of view: 98.83 – 63.97 °
- Image height: 7.962mm
- Total lens length: 70.23 – 69.98mm
- Back Focus: 14.6644 – 24.7483mm
- Zoom ratio: 1.828x
- 4 aspherical elements
