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Having used the IDAS P2 and D2 before and after modifying my dslr and before and after our streetlights were changed to LED, I didn't notice a big difference between the filters with regard to the type of light pollution, but I did prefer the colour balance of the P2 with a stock dslr and the D2 with the modified dslr.
For imaging under moonlight the Optolong L-Enhance does well (as would the STC Duo I imagine).
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