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After having used both a mono will give you better resolution than the equivalent OSC. The OSC is much more convenient to capture color. Narrowband is best done with the mono. The OSC might be a problem with lenses as you could get color fringing and usually the blues don't come in focus the same as the reds or greens. No such problem with a mono as you can focus each channel independently. Same goes for a refractor. APO will work better with the OSC than an ED for example for the above reasons. When I do color I always use my OSC. When I do NB I always use my mono. They complement each other IMHO.
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