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Apart from stacking, the only thing done to the images was to adjust levels to remove pollution.
I've got an old NP image of Carina with a 600d but it's also more red. Also images from an Esprit 80 f/5 were more red. So I'm thinking it's either the different f ratio or different glass/coatings.
Next clear night I might try the FC100 without a reducer: in comparison to the existing FC image, a more faded look would point to f-ratio while more red would point to the reducer robbing colour.
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