For action, it is best to prefocus. 视乎情况,机系死的,人系生的,要懂得变通。
Apply on the public square, airport, wharf, station, building lighting, advertisement plaque, exhibition center etc prefocus lighting. 适用于广场、机场、码头、车站及广告牌、展览馆等聚光照明。
Dimensions for Projection Lamps - Four-Pin, Prefocus, Base-Down Type 放映灯规格。四脚预聚焦灯头向下型
4. it has focusing device, which can make adjustment of astigmatism and prefocus. 4.;具有调焦装置,可以进行散光和聚光调节。
4、It has focusing device, which can make adjustment of astigmatism and prefocus. 好,抗冲击性能好。4、具有调焦装置,可以进行散光和聚光调节。