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I always used a CWB on my modified 40D when shooting astro. I had 2 set. One for use with my clip in LPS filter and one for use without the filter. CWB means custom white balance, it does not effect what the sensor sees, it effects how the image is processed inside the camera. As you have seen, a CWB makes the modified camera produce true colour daylight images. Same goes for astro shots. I found it made astro images a lot easier to post process.
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