I don't know about the iss specifically, but was stunned that taking a handheld photo with my huawei mate p20 pro - I could capture bright city lights, the aurora and a few bright stars shining through the aurora - in the same frame.
I'd be hard pressed to manage the same with my (old) dslr.
Yes. It's a combination of high iso with relatively low noise, and some enforced heavy handed post-processing in the camera app. And perhaps multiple exposures, I suspect. The pictures aren't "great" - but considering it's just "point and shoot" - I found it pretty impressive.
Let me see if I can't upload a couple of examples.
Ed: Any easy image hosting sites that work on mobile and allow selective whitelisting of exif data? I might want to strip time/GPS, but keep/present exposure information.. All without having to go via a desktop image program.
I've seen the ISS at -10 magnitude, at that brightness we could see it through thick clouds!! So probably part of it is waiting for it to be very bright.
I'd be hard pressed to manage the same with my (old) dslr.