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If he has a 2 " T ring then he will be able to get filters to fit. As I understood they only come in either 1 1/2" or 2 "? Either way here's a picture of mine with a light pollution filter attached, which just screws right onto the adapter. It's a great way to help chase those faint nebulae and one of the first filters I bought after moving away from Luna photography myself.
Cheers!
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