他的眼睛累了，调节焦距困难。
His eyes were so tired that he had difficulty focusing them.
双筒望远镜是用一个旋钮调节焦距的。
计算越精确就有如调节焦距般的效果：图像更清晰。
More accurate calculations would have the same effect as focusing a lens: the picture becomes sharper.
眼镜鼻梁架上的手动滑动件通过调整膜片形状来调节焦距。
A manual slider on the bridge of the eyeglasses adjusts the focus by changing the shape of the membrane.
这个过程可能很乏味，因为你要先建立平面，还不得不去旋转摄像机，并调节焦距以得到好的匹配效果。
This can be a tedious process because the first time you create the plane, you have to rotate the camera and change the focal length at the same time to get a good match.
本发明公开了一种用于手机镜头的伸缩机构，旨在解决现有的手机不能通过镜头的伸缩来调节焦距之缺陷。
The invention discloses a telescopic mechanism for mobile phone lens, which is object to resolve the defect that the prior mobile phone cannot use the lens telescoping to regulate the focal distance.
随着焦距调节，拍摄重点越发清晰，使美国宇航局分析家都不敢相信自己的眼睛了。
AS adjustments were made and the focus sharpened, NASA analysts couldn't believe their eyes.
别忘了调节镜头的焦距。
因此光学系统焦距、光圈的调节直接影响系统的成像质量。
Therefore the adjustment of the focal length and the aperture of the optical system have direct influence on the imaging quality.
科学家和工程师在接下来的几周内将校准开普勒的科学仪器——光度计，并调节望远镜基线以获得最佳焦距。
Scientists and engineers will spend the next few weeks calibrating Kepler's science instrument, the photometer, and adjusting the telescope's alignment to achieve the best focus.
别忘了调节镜头的焦距。
这款相机模组还有外置握持垫，焦距调节滚轮，还有快门和录像按钮。
The phone then has an external grip pad, a zoom wheel, and shutter and record buttons.
这款相机模组还有外置握持垫，焦距调节滚轮，还有快门和录像按钮。
The phone then has an external grip pad, a zoom wheel, and shutter and record buttons.
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