Archive for: 16-35

Patent: A new 16-35 f/2.8 or Faster Concept?

Patent: A new 16-35 f/2.8 or Faster Concept?

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

  1. Zoom ratio 2.06
  2. 24.02 – - 33.99mm f = 16.49 focal length
  3. Fno 2.15 – 2.46 – 2.94
  4. 42.02 – - 32.48deg 52.69 angle of view.
  5. Image height 21.64mm
  6. 171.08 – - 172.88mm 176.23 full-length lens
  7. BF 39.26 – 46.99 58.75mm
  8. 18 sheets 13 group lens configuration
  9. Three three aspherical surface
  10. 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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