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PSA: a guy at the Grand Rapids astronomy club told me to stop shooting at ISO 3200 and my Milky Way shots finally cleaned up
I posted a stack of 40 subs from Lake Michigan dunes last spring and he said the grain was eating my stars, so I dropped to ISO 800 and doubled my exposure time instead. My last set of Andromeda frames came out way smoother and I only had to toss 3 of them. What ISO do you all settle on for deep sky stuff with a crop sensor?
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the_paul1d ago
Man, this takes me back to when I first got my crop sensor and thought cranking the ISO was the fix for everything. I spent a whole night at a dark site shooting Orion at 6400 because I figured more sensitivity meant more signal, and when I got home half the frames were so noisy I could barely pull anything out of them. The funny part is my buddy shooting next to me on a beat up old Rebel was getting cleaner shots at 1600 with longer subs, and I was too stubborn to ask why. Turns out the sensor was just fine, it was my settings that stunk. Live and learn, right? I've been curious how much of this comes down to the sensor itself versus just getting the sub length right for the sky conditions you're under.
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