Thanks all for the replies.
Yes, I found that article too yesterday evening and intended to read it thoroughly this morning.
Anyway, what I do at the moment is take many pics in a sequence (this is possible in iCap) and then select the best pics for post-processing... It is amazing how the pics can change in quality from one sec to the next.
I have a dark orange filter, which is obviously not the same as red, but could buy a red one too and give it a go. I can use it for something else if it doesn't work. A colour filter is not very expensive anyway.
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