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Marc, thanks for your input. The Canon usb and also the dc cable both have ferrite suppression. Also on cheching earlier subs I found that those lines are present when just using the battery instead of the power supply.
My current thinking is a timing issue with the usb. I had been downloading the frames as colour processed tricolour fits instead of CR2 files. This takes longer to download than the native CR2 and might be the source of timing issues??
When the sky clears I will take some 5min subs and download as CR2 files and see if that clears the lines. There is surprisingly little info on the web that I could find...one post on one forum that remains un answered since 2005....not good.
If all else fails I think I can work around the issue by shifting the guide position slightly from frame to frame, align and median combine to remove the outlier pixels from ther final stack result. But not much is giong to happen by way of testing with cloudy skies.
cheers,
Doug
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