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Yes it is the response of the light sensors in your eyes that govern the view you have of the nebulae. As said the narrow band "rods" are tuned to the centre of the visible spectrum around green and are quite a few orders of sensitivity better than the "cones" that can respond to the various other emission lines for the different colours.
Many people claim to see different colors in the nebulae but it is generally an optical illusion due to the way your brain perceives the signals from the eye particularly when you stare at the very dim images for long periods.
Barry
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