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I doubt the need for the IR/UV is that critical if you are imaging with the Ha, but I am guessing.
In my case I use a one shot colour camera, and ST2000XCM, and when using an Ha filter, that is all I use, just the Ha. If normal OSC RGB imaging I use a Baader IR/UV. Best option is to try both scenarios, and that will tell you (and others who I am sure also are interested) what the answer is.
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