Capn Fishy wrote in post #15879334
=Cap'n Fishy;15879334]I'm thinking about Isaac Newton here. Doesn't IS act on acceleration? If you pan at a constant speed, how does the mechanism detect that anything is moving, and why does this upset it so?
Col
=Cap'n Fishy;15879334]I'm thinking about Isaac Newton here. Doesn't IS act on acceleration? If you pan at a constant speed, how does the mechanism detect that anything is moving, and why does this upset it so?
Col
The IS unit in Canon lenses is based upon a gyro that moves a glass element in the opposing direction of the movement. The gyro registers primarily vibration. Acceleration has no effect on the gyro.
Even the smoothest panning will have movements in all other directions. L lenses with IS mode switch will ignore your panning direction (in mode 2) and counteract all other movements. Those gyros are almost identical as those used in Radio Controlled planes. While the gyro is fixed programmed in terms of compensation gain, I can change my gyro gain from my transmitter to change the behavior of my plane or helicopter.
IS in mode 1 will try to compensate any directional movement, which includes your panning.
| Ʃ 100 - 300 | Pancake | Tammy 70-200 Di
