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So I've been doing some testing with this issue over the last few nights.
The attached screenshot compares the initial image (right) with the same subject with the B filter rotated 90 degrees. The images are the background extracted by the DBE function in PI. They have the same level of screen stretch.
To me, the deep blue has been shifted clockwise.
I've just imaged with the camera rotated to see if its an issue with the camera. Next is to image after rotating the filter by an extra 90 degrees ie 180 degrees from the initial position.
Will be interesting to see what happens. My money is on LP rather than CCD defect or filter problem.
Pete
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