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I use an Atik 420, the same sensor as yours... The sensitivity to Ha isn't great, so you should probably think about the Astronomik 12nm bandpass Ha filter.... Ha filters aren't good for observing at all, only imaging....
Your O-III should be good - just make sure you are blocking IR, ie - if it is a CCD O-III filter you'll be fine, a visual one you should use an IR filter also....
I use the Astronomik Ha/O-III with mine, they work fine....
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