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	Term	术语	Definition	定义
	focal distance	焦距	See FOCAL LENGTH.	参见focal length（焦距）。
	focal length	焦距	The distance from the rear NODAL POINT of a LENS to the FOCAL PLANE for an object at infinity. The distance from the surface of a MIRROR to ... more The distance from the rear NODAL POINT of a LENS to the FOCAL PLANE for an object at infinity. The distance from the surface of a MIRROR to its FOCUS. Also called focal distance.	指透镜后节点到焦平面的距离。反射镜焦距指镜面到焦点的距离。也称为focal distance（焦距）。
	focal length: calibrated	NULL	An adjusted value of the EQUIVALENT FOCAL LENGTH computed to distribute the effect of lens DISTORTION over the entire field used in an AERIA... more An adjusted value of the EQUIVALENT FOCAL LENGTH computed to distribute the effect of lens DISTORTION over the entire field used in an AERIAL CAMERA.	NULL
	focal length: equivalent	NULL	The distance measured along the AXIS OF LENS from the rear NODAL POINT to the plane of best average DEFINITION over the entire field used in... more The distance measured along the AXIS OF LENS from the rear NODAL POINT to the plane of best average DEFINITION over the entire field used in an AERIAL CAMERA.	NULL
	focal plane	焦平面	A plane parallel to the plane of a LENS or MIRROR and passing through the FOCUS. In PHOTOGRAPHY, the plane (perpendicular to the axis of t... more A plane parallel to the plane of a LENS or MIRROR and passing through the FOCUS. In PHOTOGRAPHY, the plane (perpendicular to the axis of the LENS) in which IMAGES of points in the object field of the LENS are focused.	过焦点与透镜或者反射镜镜面平行的平面。在摄影学指透镜物方视场像点聚焦的平面（与透镜主光轴垂直�... more 过焦点与透镜或者反射镜镜面平行的平面。在摄影学指透镜物方视场像点聚焦的平面（与透镜主光轴垂直）。
	focal-plane plate	压片玻璃，接触压平板	A glass plate set in the CAMERA so that the surface away from the LENS coincides with the FOCAL PLANE. Its purpose is to position the EMULSI... more A glass plate set in the CAMERA so that the surface away from the LENS coincides with the FOCAL PLANE. Its purpose is to position the EMULSION of the film in the FOCAL PLANE when the film is physically pressed into contact with the glass plate. Also called contact glass or contact plate.	装在摄影机里的玻璃板。其中离透镜较远的压平玻璃表面与焦平面重合。其目的是当胶片被压到玻璃板上�... more 装在摄影机里的玻璃板。其中离透镜较远的压平玻璃表面与焦平面重合。其目的是当胶片被压到玻璃板上时使胶片的乳胶面位于焦平面内。也称为contact glass，contact plate。
	focal-plane shutter	焦面快门，帘式快门	See SHUTTER.	位于焦面附近的快门，一般由带缝隙的遮光帘构成，遮光帘拉离焦平面产生曝光。
	focal point	焦点	See FOCUS.	参见focus（焦点）。
	focus	焦点、震源	(pl. foci). That point at which parallel RAYS of light meet after being refracted by a LENS or reflected by a MIRROR. Also called focal poin... more (pl. foci). That point at which parallel RAYS of light meet after being refracted by a LENS or reflected by a MIRROR. Also called focal point. In SEISMOLOGY, the source of a given set of elastic WAVES. The true centre of an EARTHQUAKE, within which the strain energy is first converted to elastic wave energy.	在光学中指平行光线经透镜折射或者经反光镜反射后聚焦的点。也称为focal point。在地震学中指地震波的�... more 在光学中指平行光线经透镜折射或者经反光镜反射后聚焦的点。也称为focal point。在地震学中指地震波的发源地。某一地震的中心，在这里地球的应变能首次转换成地震波。
	focus	聚焦	(v.t.). The process of adjusting an optical instrument, PROJECTOR, CATHODE-RAY TUBE, etc., to produce a clear and well-defined IMAGE.	调节光学仪器、投影机、阴极射线管等形成清晰影像的过程。
	fog	雾	Suspension of very small water droplets in the air, generally reducing the horizontal VISIBILITY at the EARTH's surface to less than 1 kilom... more Suspension of very small water droplets in the air, generally reducing the horizontal VISIBILITY at the EARTH's surface to less than 1 kilometre.	悬浮在空气中的微小水珠群。通常能使地球表面的水平能见度小于1千米。
	fog: advection	锋面雾，平流雾	FOG which forms in the lower part of a moist AIR MASS which moves over a colder surface.	潮湿、温暖的空气团在较冷表面移动时，在其底部形成的雾。
	fog: ice	冰雾	Suspension of numerous minute ice crystals in the air, reducing the VISIBILITY at the EARTH's surface.	悬浮在空气中的大量的细小冰晶群，它能减小地表的能见度。
	fog: sea	海雾	ADVECTION FOG which forms over the SEA.	海面上形成的平流雾。
	fog: wet	湿雾	FOG formed of droplets sufficiently large to deposit water on objects.	水珠较大的易湿物体的雾。
	fog bank	雾堤	FOG, generally caused by local conditions, which extends over a small area some hundreds of METRES wide.	通常由当地环境影响形成的、在宽度只有几百米的小范围内扩散的雾。
	fog bell	雾钟	A bell used as a FOG SIGNAL.	一种作为雾信号的钟。
	fog detector light	雾情探测灯	A light used to automatically determine conditions of visibility which warrant the turning on or off of a sound signal.	一种用于自动探测能见度状况的灯，以便根据探测结果确定打开或者关闭声信号。
	fog gong	雾锣	A gong used as a FOG SIGNAL.	作为雾信号使用的锣。
	fog gun	雾炮	A gun used as a FOG SIGNAL.	作为雾信号使用的炮声。
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