Focus: plane of focus; focal length; and depth of field.
焦距：焦点平面，焦距和景深。
The field of view can be limited by inserting a stop in the focal plane of microscope.
可以在显微镜的焦平面上加装一光阑，从而限制视区。
A staring imaging laser detecting and warning system is formed by using 4-channel uncooled infrared focal plane detectors, large field optical system, narrow band filters and signal processing system.
利用四路红外非制冷焦平面探测器、大视场光学系统、窄带滤光片和信号处理系统，构成了凝视成像激光探测与告警系统。
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