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I find that the Baader Semi-Apo filter cleans up CA on my 102mm F6.5 Achro quite nicely. Id say ~80% reduction on Jupiter. It does add a gentle yellow tinge though. But that's alright with me. I find without it Jupiter is almost non-observable in my opinion. But, with the filter, the CA is mostly removed I can I see subtle details in the colorbands I couldn't before. It really is a difference maker.
With the filter CA is on, objects like m45 is from almost, to approaching, practically invisible(Does that make sense? That sentence makes sense in my mind). The filter is attached to the diagonal all the time.
Mind you to be balanced. I have not tried it at a dark site yet where star brightness is turn up to 11.
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