Rich colouring there Paul.
Can you answer this question? Doesn't the modified Canon camera have the IR cut filter removed to capture more of the infra red range which is in most diffuse nebula. So by putting a infra-red cut filter back in front of the camera would undo to some extent what the modification was meant to do.
Hope you can understand what I am trying to say. It is just a thought I have come across, that I cannot answer.
Your photos as always are excellent.
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