Thankyou for the kind words! I have only recently tried longer exposures of the Milky Way using the astrotrac, I had almost 2 months of bad weather coupled with bad timing stopping me but I am pleasantly surprised at how the pictures turned out.
As for the ISO, I check the histogram on camera just to make sure the colours aren't clipped, but the 6D works well at 4000 ISO, it is a wonderful camera.
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