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Yeah what Mark said about the Canon long exposure noise reduction. I don't use it, i shot all my darks at the end of the session and subtracted them myself.
I ended up shooting those at Voyager point (that's what my gps said anyway) as I was driving aimlessly around for somewhere dark(ish) as it was windy as all hell at Stanwell Tops so i drove inland.
It's basically near Holsworthy, so it's not right in the city or anything, but still was surrounded by street lights and what not anyway.
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