另一方面，TTL模式是由相机和闪光灯决定输出光量的。
Through-The-Lens (TTL) mode, on the other hand, puts the flash unit’s output under the control of the camera and flash.
这两个平面垂直于相机的方向，并且由相机的位置来确定。
The planes are laid out perpendicular to the Camera's direction and are measured from the its position.
构造干扰观测器，观测出由相机运动产生的等效干扰力矩。
Equivalent disturbance moment by the infrared camera moving is seeked by constructing disturbance observation.
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