系统具有镜片少，结构简单，变焦轨迹平滑无卡滞等优点，可用于模拟不同尺寸的闪电单元。
The beam expanding system has some advantages of fewer lenses, simple structures and smoothly zoom trajectory, and it is suitable for simulating lighting elements with different sizes.
采用无焊接工艺，使镜片更环保，更美观！
Adopting no welding technology, making the lens environmental, more beautiful!
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