New Canon EF 24-70mm f/2.8L IS Lens Patent

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