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1.
Having three focal lengths.
焦距的有三个焦距
2.
equivalent focal length
当量焦距,等效焦距
3.
Focus-to-film distance(f.f.d)
焦点-胶片距离(焦距)
4.
autofocus zoom lens
自动聚焦变焦距镜头
5.
long focus lens
焦距(望远)镜头
6.
Focal length: The distance between the centre of a lens and its principal focus.
焦距:镜头中心与其主焦点的距离。
7.
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快速变焦距手术显微镜
8.
Only a bit out of focus.
只是焦距有点不对。
9.
One must focus the camera before taking a picture.
拍照之前先要对焦距
10.
The image is out of focus.
这影像的焦距没调好。
11.
Don't forget to focus the lens.
别忘了调节镜头的焦距
12.
rear-controlled zoom lens
背面调整变焦距透镜
13.
best image plane of zoom lens
焦距物镜的最佳像面
14.
image plane displacement of zoom lens
焦距物镜像面位移
15.
manual zoom lens
(镜头)手控可变焦距透镜
16.
He focused the camera and took a photo.
他对好焦距,照了一张相。
17.
Eyeglasses having trifocal lenses.
有三焦距镜片的眼镜
18.
the ratio of the focal length to the diameter of a (camera) lens system.
相机镜头直径焦距比。