It is the distance between the lens diaphragm and the image plane.
即是镜头光圈与影像平面之间的距离。
Lena unit, lens, optical device, image reading unit, scanner and image forming device.
透镜单元，镜筒，光学装置，图像读取单元，扫描仪和图像形成设备。
Not much doubt here about which lens produces the better image.
哪个镜头的成像更好是很容易看出的。
His lens draws the beauty of each young person into the image.
他的镜片把每个年轻生命的美丽画进了相片中。
His lens draws the beauty of each young person into the image.
他的镜片把每个年轻生命的美丽画进了相片中。
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