Patent: Tamron 70-200 f/2.8 VC

Another new 70-200 f/2.8
It looks like Tamron is going to be refreshing their 70-200 f/2.8 with a new version. The new version will add Tamron's vibration correction as well as a new optical design.

2012-58619,2012-58620 Patent Publication No.

• 2012.3.22 Release Date
• 2010.9.10 filing date

Example 1

• 111.5353 – – 194.0928mm f = 71.5336 focal length
• Fno 2.9
• 20.71 – – 12.48 deg 34.66 angle of view.
• Magnification ratio 2.713
• 18 sheets 13 group lens configuration
• Three three aspherical surface
• 3 ED glass sheet
• Super ED lens equivalent to 1 XLD glass sheets and fluorite ※

Tamron's patent

• Positive-positive four-group zoom of positive and negative
• Inner Focus
• Focusing for the third lens group
• Made compact and lightweight AF speed of the focus group
• Lens consists of a single sheet of focus group
• Inner zoom
• Shake correction
• For anti-vibration part of the fourth lens group
• Compact, lightweight unit
• By a small amount of shift in anti-vibration, energy saving

Source: [EG]

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