![]() A higher signal will result in less noise even with a high ISO (depending on your camera, modern sensors are much better). If you exposure for a longer period of time, you’ll capture more light, and have a higher signal to noise ratio, meaning less noise. But the noise isn’t all just from the high ISO. If you’ve done any night photography, then you’re likely very familiar with the noise of exposures in low light using a high ISO. The green color in the sky is from airglow. ![]() ![]() The Milky Way rises over a fairly intimate canyon view in Canyonlands National Park in Utah.
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