The iPhone camera has a fixed focal length.
iPhone的摄像头有焦距固定。
One zoom lens can replace several fixed focal-length lensed, but results are likely to be inferior.
一个变焦镜头可以代替多个固定焦矩镜头，但效果很可能比不上。
Zoom lens a lens whose focal length can be varied continuously over a substantial range. one zoom lens can replace several fixed focal-length lensed but results are likely to be inferior.
变焦镜头可以把焦矩在相当大的范围内连续改变的镜头。一个变焦镜头可以代替多个固定焦矩镜头，但效果很可能比不上。
Zoom lens a lens whose focal length can be varied continuously over a substantial range. one zoom lens can replace several fixed focal -length lensed but results are likely to be inferior.
变焦镜头可以把焦矩在相当大的范围内连续改变的镜头。一个变焦镜头可以代替多个固定焦矩镜头，但效果很可能比不上。
Compensating for temporal drift of fixed-pattern noise is an important problem in the techniques for nonuniformity correction of infrared focal plane arrays.
补偿固定噪声的时间漂移是红外焦平面非均匀校正技术中面临的一个重要问题。
When the aperture diameter of an optical system is fixed with the same orbit height, the resolution of ground objects can be improved by increasing the focal length.
当光学系统口径一定时，在相同的轨道高度条件下，增大焦距可以提高地面分辨率，增大系统的视场角可以扩大对地面的覆盖宽度。
Then, image surface position was kept steady during a zooming process by controlling the spherical aberration of front fixed group and the focal length of back fixed group.
之后，通过合理控制前固定组球差及后固定组焦距，使变焦过程中的像面保持稳定。
Then, image surface position was kept steady during a zooming process by controlling the spherical aberration of front fixed group and the focal length of back fixed group.
之后，通过合理控制前固定组球差及后固定组焦距，使变焦过程中的像面保持稳定。
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