Alex, I've been using my own extensions made from black felt stiffened with model aeroplane dope for YEARS, but I find it doesn't help at all here (It did where we lived previously). Of course, an extension won't help with sky glow, only what is around you, and Taks do a darned fine job at that. I have often looked DOWN the dewshield to see if there was ANY illumination, and there is none visible.
As I said, with Pixinsight processing, I don't really worry about LP as it is removed almost perfectly. Hence why I do not even use LP filters of any kind any more. The only filter I use is a UV/IR.
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