![]() ![]() The result is that you’re usually shooting with a shutter speed that captures enough light for tolerable noise, but it’s also probably long enough that the stars trail in the frame. So you’re stuck using a shutter speed that isn’t long enough to capture enough light for a high signal, and having to use a high ISO as well to boost the signal to a usable level, which can add additional noise to the image (although how much depends on your camera). However, when shooting the Milky Way you’re usually going for short star trails, or completely pinpoint (trail-less) stars, which means you’re limited in how long you can expose before the stars appear to move too much in the frame. 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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