Capturing an accurate (and beautiful) view of the heavens is the goal of the astro-photographer, but for the shooter looking to capture the majesty of the Milky Way without star trails, it’s often necessary to turn to expensive pieces of hardware called star trackers.
How does the ISO setting affect the results in digital capture? My objective is to create a good-quality 16x20 print. Let’s say there’s no movement of the subject involved. How would the image look at ISO 100 compared to ISO 400?