DeepSkyCamera is an app for Android. You can take pictures of the stars including a plan. You take the pictures
in RAW. Android uses the format DNG which can be processed with the well-known stacking software (DSS, Sequator, PI).
You can take also flats, bias and dark frames. Its very similar to take pictures witha DSLR oder CCD/CMOS camera.
After that you can do the post-processing with the stacking software as well as with Photoshop, Gimp or PI.
DeepSkyCamera takes only the pictures. The app is not designed for the post-processing.
Preview with 1 sec exposure time. You can see the brightest stars and you can set the phone in the right direction.
taking pixctures with a plan for lights, darks, bias and flat frames
takes pictures in DNG (RAW)
you can set ISO, exposure time, a pause between each frame, number of pictures
sd card is automatically detected
saves the settings to the phone and loads it during startup
you do not have to focus the camera - focuses automatically to infinity.
Android 6.0 or higher
Your phone must support DNG / RAW. The app checks the support of RAW / DNG upon startup.
How to track the stars
You can use a simple mount for travel purposes like iOptron
SkyTracker, AstroTrac or StarAdventurer. You put a ballhead on the top and add a clip from a small phone tripod.
With the preview function (which is automatically visible after start) you can adjust the ballhead according to the brightest stars.