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Yeah, I would avoid the T-thread ones, as they are very limited.. the most usable type would be the 2" mounted filter... they can be used on any 2" nose piece, or on the end of a flattener or MPCC, and in most CFWs...
The Astronomik 12nm filters do a good job.. though they are fairly wide bandpass... The Baader 7nm filter is fantastic, depending on where you buy it, its usually a lot cheaper too..
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