A patent for an EF 24-70mm f/2.8L IS lens has spotted on egami, this has been a lens that has been talked about for several years. Another 24-70mm f/2.8L II USM lens delayed until September, 2012.
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
