Canon filed a new patent in Japan. The new patent describes a new CN-E 18-85mm f/2.8, CN-E 15.5-47mm f/2.8 lenses for Cinema products.
Both Canon lenses features constant F2.8 aperture throughout the zoom range. The CN-E 15.5-47 t2.8 is a compact zoom which Canon announced in 2012.
The patent for the 18-85mm seems to share the same optical formula as the already released CN-E 15.5-47mm f/2.8 lens.
Canon CN-E 18-85mm f/2.8 Cine Lens Patent
- Patent Publication No. 2015-4917
- Published 2015.1.8
- Filing date 2013.6.24
- Example 1
- Zoom ratio 2.80
- Focal length 16.00 29.68 44.80
- F number 2.80
- Half angle (in degrees) 43.15 26.81 18.51
- Image height 15.00
- Overall length of the lens 263.54
- BF 39.04
- Example 2
- Zoom ratio 4.50
- Focal length 18.50 45.61 83.25
- F number 2.80
- Half angle (in degrees) 39.04 18.20 10.21
- Image height 15.00
- Lens length 263.78 263.78 263.78
- BF 46.93 46.93 46.93
- Canon patents
- 5-group zoom of positive and negative negative-positive-positive
- Inner focus (part of the first group)
- Inner zoom
