I've been researching the LP filters myself, trying to decide between the Astronomik and the Hutech.
From what I understand, the CLS works with either.
There is also a CLS-CCD which has the IR cut for modded camera's that don't have a replacement IR cut filter, though the filter curves provided on their site for these two(CLS vs CLS-CCD) are confusing. I think maybe they have accidentally switched them?
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