Quote Originally Posted by mjs1973
I was using my 24-70mm f/2.8 lens. I don't remember the focal length but I'm guessing it was around 50mm or so.

The exposures were 30 seconds each, but they are all stacked on top of each other so the trails you see in the image are equal to a 12.5 minute exposure.
Ahhh, now it makes sense!

Thanks for clearing that up.