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I use an Astronomik CLS clip in filter. Its nice and dark where I live but when I go to my brother's house in Houston the light pollution is terrible. The CLS works well to kill the light pollution. It will impart a green cast to your images however. Easily taken care of with a free filter called HLVG Hasta La Vista Green. You should also pick up WhiteCal and the other color manipulation filter they have on the site. I use HLVG and WhiteCal but haven't messed with the other one. I really like the clip in filters. I have a large variation in my lens front elements so I would spend a lot of money if I had to equip them all or go to step down rings which I don't like to use. I had their full set of filters on my old rig and the Ha Hb and OIII. That was 15 years ago lots of new filters on the market. I've had good results from their stuff so I didn't really investigate some of the newer entries to the field.
Griz
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