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Peter,
Mark is active on the Solar Chat site and his results mirror what others have concluded.
The first line of attack is definitely the tilter - this changes the effective thickness of the chip cover plate and tends to suppress the NR. The optical wedge has the same effect.
NR are definitely aggravated by the use of barlows etc.
The tests this morning - rotating the axis of the blocking filter - no significant improvement.
Increasing (further - longer screws fitted) the tilt does suppress the NR.
I conclude that the tilt axis should be aligned with the height of the chip, this seems to give repeatable results - maybe with slightly reduced tilt
Onwards and Upwards.
( The ambient temperature/ camera temp and seeing conditions can also affect NR)
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