Depending on the lens' focal length, the image will deform and affect how the image looks in photos.
根据镜头焦距的不同，图像会随之变形并且会影响最终的照片效果。
The reason for this is that as we know, longer focal length lenses magnify the image, but they also magnify the camera shake.
正如我们前面所学，更长的镜头焦距虽然放大了图像，但同样增加了镜头抖动。
Using a longer focal length and photographing stars far from the north star increase the distance stars will move across the image.
使用长焦镜头拍摄远离北极星的星星，会增加星星在相片上移动轨迹。
If the objective lens is closer to the compact disk than the focal length of the object lens then the cylindrical lens creates an elliptical image on the photodetector array.
如果物镜与光盘之间的距离短于物镜的焦距，柱面透镜就会使在光电探测器阵列上的成像变成椭圆影像。
If the objective lens is closer to the compact disk than the focal length of the object lens, then the cylindrical lens creates an elliptical image on the photodetector array.
如果物镜与光盘之间的距离短于物镜的焦距，柱面透镜就会使在光电探测器阵列上的成像变成椭圆影像。
Better estimates of lens distortion and focal length will be obtained if the grid is positioned accurately over as much of the image space as possible.
更好的估计和焦距的透镜畸变能获得网格定位准确在尽可能多的图像尽可能的空间。
If the objective lens is further away from the compact disk than the focal length of the object lens then the cylindrical lens again creates an elliptical image on the photodetector array.
如果物镜与光盘之间的距离长于物镜的焦距，柱面透镜也会使在光电探测器阵列上的成像变成椭圆影像。
A method is introduced for testing stray light coefficient, vignetting coefficient and image surface uniformity optical system with large aperture and long focal length.
叙述一种用于测试大口径、长焦距光学系统杂光系数、渐晕系数、像面照度均匀性等光学参数的检测方法。
Starting from the ray path equation, object-image relationships are found and used to determine the equivalent focal length and the principal planes of tapered GRIN fiber.
本文从光线轨迹方程出发，推导了锥形梯度折射率纤维的物像关系式，并得出了它的等效焦距和主平面位置。
Since this means that the focal length of the lens can also be reduced by about half, it is possible to minimize the degree of correction required for image sensor shake.
这就意味着镜头的焦距可以因此缩短一半，也可以将图像传感器震动矫正减至最低。
The important factors for laser depth-microdrilling are the sufficient power density, suitable focal length, determination of the best image plane and refocusing etc.
足够的功率密度、用适当的焦距并确定最好象面、再聚焦方法等是激光深微孔加工的重要因素。
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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