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Yes and no. When you image in narrow band it affects star colour. Often seperate images are taken unfiltered to layer RGB stars into a narrow band image. The CLS maybe useful in this situation to reduce the sky glow in that layer.
The alternative, if you are using a DSLR or a OSC camera is to buy either a dual, triple or quad band filter. Although not cheap they are a stepping stone into narrow band as they have several narrow bands in one filter. The STC duo I use is an example of this and it is amazing at blocking light pollution.
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