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.

2011 27864 fig02 - EF 300 f/4L IS II Patent
EF 300 f/4L IS II
ef300 4l is usm - EF 300 f/4L IS II Patent
EF 300 f/4L IS (1997)


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