Improved Canon ultrawide for full frame?
The world is waiting for Canon to release a top end performing ultra wide lens for full frame cameras. While I think the 17-40 f/4L is a bargain of a workhorse and the 16-35 f/2.8L II is a very solid performer, I think the line is still lacking that standout ultra wide zoom lens. I have heard numerous photographers say they'd pay “anything” for a top notch lens in that segment.
Below are 3 patented optical formulas for new ultrawide angle lenses for Canon.
A 16-35 f/2.8, a 17-35 f/2.8-4 and a 16-35 f/2-2.8. There seems to be a decent amount of f/2 patents appearing on zoom lenses from Canon, it could be time for such a lens to make it to market.
Patent Publication No. 2012-63568
- 2012.3.29 Release Date
- 2010.9.16 filing date
Example 2
- Zoom ratio 2.06
- 24.00 – – 33.95mm f = 16.48 focal length
- Fno 2.90 – 2.90 – 2.91
- 42.03 – – 32.51deg 52.70 angle of view.
- Image height 21.64mm
- 170.87 – – 172.62mm 178.10 full-length lens
- BF 40.00 – 48.45 – 61.71mm
- Lens Construction 12 group 17 sheets
- Three three aspherical surface
- 2 UD lens sheet
Example 4
- Zoom ratio 1.94
- 24.01 – – 33.98mm f = 17.51 focal length
- Fno 2.91 – 3.21 – 3.86
- Image height 21.64mm
- 174.18 – – 175.92mm 178.81 full-length lens
- BF 41.60 – 48.49 – 60.70mm
- Lens Construction 12 group 17 sheets
- Three three aspherical surface
- 2 UD lens sheet
Example 6
- Zoom ratio 2.06
- 24.02 – – 33.99mm f = 16.49 focal length
- Fno 2.15 – 2.46 – 2.94
- 42.02 – – 32.48deg 52.69 angle of view.
- Image height 21.64mm
- 171.08 – – 172.88mm 176.23 full-length lens
- BF 39.26 – 46.99 58.75mm
- 18 sheets 13 group lens configuration
- Three three aspherical surface
- 2 UD lens sheet
Canon's patent
- 4-group zoom lens of a positive negative positive and negative
- Inner Focus
- Optimized so as to reduce the field curvature of the wide-angle side
Source: [EG]
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