在测量透镜焦距时，往往由于成像质量差而影响实验的精度。
毫无焦距的眼，静静的张开，和北野烈的眼眸四目相对。
笔者以自己多年显微摄影工作之经验，就该技术的基本操作、胶片选择、焦距和曝光调节、滤色片选择等诸多技术要点作了介绍。
1·A slide lever on the bridge of the eyeglasses pushes the fluid forward or backward to alter the shape of that membrane, changing the focal distance depending on what the user is doing.
在眼镜横梁上的滑动控制杆推动流体向前或向后，以改变那层薄膜的形状，从而根据用户当前的动作来调整焦距。
2·Here the focal distance and both eyes parallax are absolute values which was measured by highly efficient sensor in one's eyes.
这就是我们两个眼球所测量得到的焦距和视差的绝对值。
3·This may avoid remedy mistake because of the actual different focal distance brings from AS function.
这样可以避免AS功能启动是由于实际的焦距不同带来的矫正错误。
4·But only with the right focal distance and correct aperture could we get the true pictures.
只有我们调对了焦距，对准了光圈，才有可能得到真实的图像。
5·Based on Lau effect in double grating, the focal distance of lens is measured.
根据计量光栅的特点，可以利用双光栅效应测量透镜焦距。