Egami, the Japanese Photography Blog has discovered a new patent filed by Sony. The new Sony patent describes a new 60mm f/2 prime lens.
At the same focal length Sigma and Tamron has lenses for several camera mounts. This lens may also be a new lens for the new Sony A7r full frame mirrorless camera.
Sony 60mm f/2 Lens Patent
Description and self-interpretation of the patent literature
- Patent Publication No. 2013-238740
- Publication date 2013.11.28
- Filing date 2012.5.15
- Example 1
- Focal length f = 1.00mm
- Fno. 2.0
- Half angle ω = 19.62 °
- 4 group 6 lens configuration
- Three 5-sided aspherical
- One ED glass
- 35mm equivalent 60mm
- Example 2
- Focal length f = 1.00mm
- Fno. 2.85
- Half angle ω = 23.31 °
- 4 group 6 lens configuration
- Three 5-sided aspherical
- One ED glass
- 35mm equivalent 50mm
- Seishibo negative-positive
- Inner focus
- The weight of the focus group
- Fast AF
- Video support
- Increase the exit pupil distance by the third lens unit
via EG
