I took a vacation to Colorado and Utah and gave it a shot with shooting starfields and star traces. These are not spectacular, but I'll give you my four best shots and a little description of what I tried.
I mostly used my 24/1.4L II lens on my 5D3, but I kind of reached the conclusion through trial and error that the results got better when I stopped down to f/2.8, so my 24-70/2.8L II was actually just as useful. I could have left the prime at home. Oh well, one lesson learned.
These first two shots are obviously from the same spot. I did the field at f/2.8 and then tried the trace at f/2. Given how bright the trace wound up being, I should have stuck with f/2.8 or even f/4 and shot longer.
I think I also found that it is not great to have the Milky Way in a star trace, because it turns into a weird whitish patch.
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