You need a better phone app. Probably have to pay for it as well.

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It should adjust to more darkness. Put your hand over the camera and the time should increase to 60 secs

Worth it, though, even though I've never tried astrophotography with a phone.

What you have to remember is, when you start getting beyond fifteen or twenty seconds on the exposure, you're going to start getting trails. I tried doing thirty-second exposures (the maximum with unmodified firmware) on my Canon 60D, and the star trails just weren't worth the extra number of stars that I was picking up on the sensor. And, since my choices were to ratchet down the exposure time, buy a tripod that could match the rotation of the Earth, or plead with the almighty to stop the rotation of the Earth for the duration (the book What If? tells us this would be bad), I went with shorter exposure times.

If I recall, the best solution is to open your aperture to its widest value, set the focus to just shy of infinity, set it on a tripod, and either trigger the shutter remotely or set it on a timer to start the imaging at some point after your hand has cleared and the tripod has stabilized. Pretty simple.

There's one more thing, and I don't know how it affects phones, but long exposures can create a fair bit of heat on the sensor, and that can muck up your shot. Given that the same sensor can shoot 4K video at however many frames per second, it's probably not the problem that it was, but you never know. I'm sure the hardware would probably kill power to the sensor if it sensed a thermal overload, but I've never looked into that.

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FYI, you can have unlimited shutter time on the canon 60D and most cameras by using bulb mode with a remote shutter control that lets you lock the shutter button down for as long as you want

Yeah, I didn't want to get the attachment, particularly after finding out that I was already getting trails at the 20 second mark. If I had a tripod that could adjust for the rotation of the Earth (which I could totally build, given my current major in college), then it'd be a good buy, but astrophotography is a flirtation more than it is a love.

Install a ProCam app, it has everything you need.

It goes to 30seconds max i believe, but the phone bas to be completely still and in the dark

You can also get “slow shutter” that stacks images, it’s a fun app and creates some cool effects.

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