带通滤光片
红外滤光片(玻璃)
红外塑料滤光片
长/短波通滤光片Happiness is like a butterfly
Happiness is like a butterfly which, when pursued, is always beyond our grasp, but, if you will sit down quietly, may alight upon you.
快乐犹如一只蝴蝶，被追求时永远抓不到，但如果你安静的坐下，它会降落在你身上。
—纳撒尼尔•霍桑
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