When you’re out taking nighttime landscape photos — Milky Way photography, or photos of the Aurora Borealis — one of the most difficult tasks is to compose your photos exactly how you want. The reason? It’s simply too dark to see anything. Looking through the viewfinder on a DSLR, it can be tough to make out any of the scene’s important features. Live view might be even worse, often showing absolutely no detail at all. The most common solution is to guess at your composition, wait 20 or 30 seconds for the exposure to finish, and adjust afterwards via trial and error. It’s a slow process — but there’s another method. This is one of the few times when the best option is to use your camera’s highest ISO.
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