New Canon Cine Lens Patents surfaced over the web: CN-E 18-85mm f/2.8, CN-E 15.5-47mm f/2.8. Both the canon lenses features constant F2.8 aperture throughout the zoom range.
Take a look at the patent details below translated by google
Explanation and self-interpretation of the patent literature
- 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
See more Canon Patents
And another cine lens.
It looks like Canon is more interested in developing and inventing video stuff than in stuff for professional photographers.
That sucks.