A good rule of thumb to minimise camera shake is to set the shutter speed at a minimum of one second divided by your focal length.
测算你相机的安全快门速度有一个好的方法，你相机镜头焦距的倒数，就是你避免镜头抖动的快门最小值。
For the first shot he used a shorter focal length and the second shot he used a longer one.
先前的一张焦距短，第二张他用了长焦。
Second, for robust estimation of camera parameter, we take into account overall color change and focal length adjustment between overlap images.
另外为了对图像进行可靠的拼接，演算法根据普通数字相机的特性，考虑了图像整体色彩变化与焦距调整。
The second part optimally designs many kinds of methods about adjustments of focal length and focusing deflection, and points out their relative superiority.
第二部分优化设计出多种调节焦长和聚焦偏转的方法，并指出各种方法的相对优势。
The first single-curved reflective surface has a focal length greater than that of the second single-curved reflective surface.
第一单弯曲反射面有一个焦距大于表面的第二个单弯反射。
The first single-curved reflective surface has a focal length greater than that of the second single-curved reflective surface.
第一单弯曲反射面有一个焦距大于表面的第二个单弯反射。
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