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Yeah that's CA. I agree with Marc, the blue layer is bloated. It's not real bad though.
Sometimes the FF can make it worse. What focal length is your scope? Televue make one but not sure if would suit. Another option is to try the Baader Semi-Apo filter. It reduces the blue channel by 50% and boosts nebula as well. It does reduce overall light however.
The next thing to try would be to reduce the blue channel saturation in photoshop or whatever program you use.
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