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I played with a C80A light blue filter, standard photographic. They are just about giving them away free nowadays as DSLRs don't need them. $10 for 5 !!
It has a much lower in height and intensity but similar profile to an Astronomik CLS (Visual). What it did was blue the sky obviously but also chopped out a lot of the LP in the red region and it reduced chroma because it cut back that red component. It required a lot more exposure but was surprisingly effective. Processing let me recover a lot of the red selectively and it kept star bloat down as well. I have intentions of trying it with my IR modded camera when the clouds allow it.
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