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I disagree with your last statement and the response curve of a mono CCD is irrelevant. Sure, the base silicon has that response but that's not what is being modified. It's a sensor with a bayer matrix and that matrix has varying levels of transmission over the spectrum, just as your earlier graph of 450D Quantum Efficiency shows.
If you took your 450D graph with the two factory blocking filters and compared it to the response with a Baader filter mod, it would show the relative increase shown in Glen's post.
Steve.
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