舞台灯光镜头则能产生边缘柔和的光斑。采用反射光学结构取得聚光效果的灯叫回光灯。幻灯系统是在聚光灯具前再加一组物镜使其投光成像。这种幻灯又可分为：①利用幻灯片成像的投景幻灯；②通过转动的圆盘式链带把云、水、火等活动形象投在景物上的投景幻灯；③利用长焦距物镜使小光斑清晰成像。突出主角形象的追光灯；④椭球面凹镜名为造型灯的灯具。
The stage light lens can produce the light spot with soft edge. The light with reflective optical structure to achieve the effect of spotlight is called back light. The slide system is to add a group of objective lens in front of the spotlight to make it project light and image. This kind of slide show can be divided into: 1. The slide show projector; 2. The slide show projector which uses the rotating disk chain to cast the cloud, water, fire and other moving images on the scene; 3. The long focal distance objective lens is used to make the small spot clear for imaging. Highlight the image of the protagonist of the rear light; ④ ellipsoid concave mirror named modeling lamp lamps.