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Lars,
I don't really do much AP....gave that up years ago to focus on Spectroscopy (and solar imaging) , however I do use the Zuiko lenses very successfully in spectrographs and the occasional lo-res spectro wide field image.
Although, I'm sure, not as good as some of the expensive lenses available today, the Zuiko 135 (and the Zuiko 200 f4) should give acceptable results.
Trying to use RGB to "build up" an improved image - I think you'll find is problematic. Start simple and see how things go.
(I've been hampered by clouds, rain and wind so unable to demonstrate any images)
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