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With a 7nm Ha you capture very little Green and Blue so it is really a waste to go to the trouble of dumping these colours. Just take the image into PShop and goto " Image", Mode, select greyscale or black and white and thats the image.
Just remember that even if the image was done with a mono camera, it would capture all photons passing through the filter be they blue or green so the Ha filter on a OSC is no different.
Keep then all but just change to grey scale.
Simple really.
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