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Peter my research, prior to removng my UV/IR blue cast filter, from Gary Honis and others, was that you can entirely remove the back filter but will still get some sharp cutoff from the front filer (aka Low Pass 1). A Baader screw in UV/IR Cut filter will give you the same result as replacing the back filter (assuming you removed the original. Spectrum runs from 400-700 nm with the Baader screw in (into you t-adaptor assuming it is threaded for filters). Thus gives you choices. I left my Low Pass 1 so dust protection stays but no longer have the UV/IR original. Focuses fine .
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