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Nice image. But I'm with Mickoid - just about any DSLR has an IR cut filter that will clobber H alpha. You had to really boost the low red signal to bring it out and that shows the noise in your small signal
Either Astro mod or get an Astro camera. I've only ever used these filters with Astro cameras or my canon with the ir filter removed. In the meantime go for some targets with stronger Ha.
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