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The phaser layer IR absortion glass blocks out the H-Alpha range. This has to be removed for great HA sensitivity. Thanks Steve yes, the CWB picks up the central spot metering and not the entire image. Best is to ensure the white paper is under sunlight and that it covers the entire image.
Heres my white balance image under sunlight. Others will be different as my IR range is not completely blocked..only slightly as mentioned in my previous posts.
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