Zoran's Blog: Astrophotography - Stacking photos with Sequator

Primer:

Set camera to manual mode
Set focus to manual and focus on infinity
Use tripod, turn off image stabilisation
Use raw rather than jpeg
Set ISO reasonably high (on my Nikon D7200 I use ISO 3200)
Set aperture to widest available (ideally f2.8 or faster)
Use 500 rule for shutter speed to avoid star trails. The 500 rule is a simple formula, for example for Nikon crop sensor with 16mm DX lens: 1.5 (crop) X 16 = 24 | 500/24 = 20 seconds
Use self-timer or remote to open shutter
Take around 8 to 12 exposures

Post processing:

Use Sequator to create single image
Use Lightroom/Luminar to adjust. For example raise the clarity in the sky, increased the contrast, bumped up the exposure just a touch, apply lens correction, which I probably should have done before anything else, try “dehaze” feature to bring out some more detail.

Mobile phone astrophotography:

Zoran's Blog