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Simple processing requires a higher signal noise ratio. I.e. more data. That's the problem I have come to realise. My eagle nebula looks much better with only 1 hour of data compared to the 3 hour shot I took in the city.
In theory the filtering should work quite well depending on the lighting source. I'm battling with the port of Brisbane which is lit predominantly by sodium vapour lamps. I understand the filters do nothing for light pollution from stadiums (metal halide floodlights), cars (halogen or vapour discharge), or homes all of which produce mainly broadband light pollution.
So in theory the light pollution filter may actually increase SNR during certain parts of the day (like after 10pm when the people go to bed and the cars disappear).
Can you relate these scenarios to your experience with the filter making not much difference?
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