Focus on an area of sky where the fireworks will be, or on an object the same distance away.
可以对焰火即将绽放的那片天空对焦，或者找个与烟花相同距离的物体进行对焦。
You need to set your focus to infinity. Try focusing on a stable object in the distance.
你要把焦点设为无穷远，对准远处一处固定物对焦。
Once you choose a lens whose focal length is closest to the focal length required by your imaging system, you need to adjust the working distance to get object under inspection in focus.
一旦你选择一个镜头其焦距是最接近于你成像系统所需之焦距，你需要调较工作距离去获取观察目标物的焦点。
The position of the image and the amplitude variation in the optical field are associated with the focus and the distance from the object to the front focal plane of the lens system.
象的空间位置和光场振幅的变化与透镜系统的焦距以及物体距焦平面的位置有关。
The principle of different details of the same object in different images was analyzed when photograph distance or camera focus varied.
分析了在实际应用中，摄像机拍摄距离或焦距发生变化时，同一对象形状在不同图像中出现细节差别的原因；
The invention is a tiny object detecting system with long focus distance and large view field, which belongs to target detecting technology field.
一种长焦距大视场无活动部件的微型目标探测系统，属于目标探测技术领域。
The invention is a tiny object detecting system with long focus distance and large view field, which belongs to target detecting technology field.
一种长焦距大视场无活动部件的微型目标探测系统，属于目标探测技术领域。
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