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I started using a CLS filter with my Canon 600D when in Sydney under Bortle 8 skies but left the subs with a blueish tinge and couldn’t totally eliminate it post processing
So I eventually ditched the filter. I use DSS to stack and Startools to remove all types of noise , does a superb job and won’t clip your data
If you use DSS to stack , stack at least 20 or 30 at same exposure length and ISO as your subs and preferably straight after your subs
In DSS under the darks tab “do not check” Dark Optimization as it can play havoc with your darks
Also previously mentioned , dithering is a must using DSLR’s especially coming into the warmer months
Hope you solve your issues
Good luck
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