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Hi Tony
Depending on what brand of dslr camera you use, you could put a clip in CLS filter above the sensor or a screw in light pollution filter in the front of your T adapter. There are several types and brands, moon & skyglow, broadband nebula filter etc.
Check out the filter makers like Baader, Astonomics, Lumicon, Thousand Oaks and more. There must be threads on here discussing the topic, do a search.
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