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You should be able to use just the CLS. According to the Astronomik info on the CLS and CLS-CCD the only difference is the IR blocking on the CCD version. I guess it wouldn't make any difference if you used the CLS-CCD as you can't really block the same light twice...?
If it was me I'd get the CLS-CCD so that if I got a different camera which didn't have a built-in IR blocking filter then I could still use it.
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