Patent – Canon EF 24-70 f/2.8L IS

You want IS?
A patent for an EF 24-70 f/2.8L IS has surfaced finally, this has been a lens that has been talked about and desired for a long time.

We mentioned some time back that there were 5 or 6 version of the new 24-70, and one of them had IS. Canon decided against an IS version for reasons to do with weight, size and cost from what I’m told.

Sadly for the ones that want an IS version of this lens, I have little faith that such a lens will be coming any time soon. Patents can sometimes appear after a product has been announced, and that’s probably what has happened here.

Canon EF 24-70 f/2.8L IS

Patent Publication No. 2012-123156

  • 2012.6.28 Release Date
  • 2010.12.8 filing date

Example 1

  • Zoom ratio 2.46
  • 68.99mm – f = 28.00 focal length
  • Fno. 2.88
  • 17.41 deg – 37.69 half angle of view.
  • Image height 21.64mm
  • 222.38mm – 192.25 full-length lens
  • BF 39.98 – 53.68
  • Effective diameter 74.47mm ball before
  • Effective diameter aperture 31.23mm
  • 19 sheets 12 group lens configuration
  • Three three aspherical surface
  • 2 UD glass sheet

Example 2

  • Zoom ratio 2.86
  • 68.70 – f = 24.00 focal length
  • Fno. 2.88
  • 17.48 deg – 42.03 half angle of view.
  • Image height 21.64mm
  • 224.86mm – 191.93 full-length lens
  • BF 39.85 – 55.68mm
  • Effective diameter 77.29mm ball before
  • Effective diameter aperture 32.58mm
  • Lens Construction 12 group 21 sheets
  • Three three aspherical surface
  • 2 UD glass sheet
  • Five-group zoom positive and negative positive positive and negative
  • (For Focusing group 2) Inner Focus
  • (Part 1 of the fourth lens group, anti-vibration unit is L4a) image stabilization
Source: [EG]

cr

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