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Hi, when looking at Orion it will appear mainly blue or a little green depending on the night with bright white and white blue core. You will not see the Ha red with the human eye. Photos will bring out the red if the camera does not have an IR filter. As for needing something bigger than 25" wow. Using various eyepieces will bring out the subtle colours but in Orion these will be predominantly subtle variations of blue and white.
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