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I've used both the IDAS and CLS filters on my TEC refractors imaging from Sydney. They are both good but in heavy LP I think the CLS does a better job for luminance. With the IDAS I just put it in front of all my LRGB filters and was quite satisfied with the result. With the CLS I replaced the luminance filter and selected RGB filters that offered some help in cutting LP frequencies. When I last checked Baader seemed to feature this more than the Astronomic filters. One thing has become quite clear to me imaging from a LP site is that you cannot collect too much data; the more the better!
Peter
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