EF 300 f/4L IS II Patent

A patent for a 300 f/4L IS II has been filed in Japan. Remember, patents don’t always become real products.

Patent Publication No. 2011-27864

• published 2011/02/10
• filled 2009/07/23
• Embodiment 1
• focal distance f = 294.00mm
• Fno = 4.14
• angle of view 8.24 degrees
• image circle 43.28mm
• lens length 245.03mm
• back focus 86.14mm

The Camera Shake:

• The shake by a human is around 0.1-10Hz (low frequency).
• The shake by a tripod is around 4-35Hz.
• The shake by an in-vehicle camera is several Hz – around several hundred Hz (high frequency).
• The conventional camera shake revision cannot revise a shake of the high frequency.
• Because the shake revision revise a shake by mechanical movement.
• The electro-optic effect supports movement of 100Hz or more kHz.

Pictures after the break.

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