They are usually much more expensive and delicate than absorption filters.
2.
For cameras, however it is now more common to have an absorption filter array to filter individual pixels on a single CCD array.
3.
The chemicals, being transported to the Ness Ziona research center from a producer in the United States, were to be used to test absorption filters, Israel said.
4.
Also, a question from Mark Viking above makes me wonder whether harmonic absorption filters should also be mentioned ( though I would accept " no " as an answer ).
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