Last week I went to Tahoe to do some astrophotography.
I watched this video (https://www.youtube.com/watch?v=Rydg7JGTAbw) about image stacking to reduce noise in my photos so I decided to give it a shot.
My setup: Sony A7ii with Batis 2.8/18 lens. I shot all my photos with ISO 1600 with a tripod for 25 seconds of exposure. My aperture is f/2.8 and I set my focus distance to my hyperfocal distance for all my shots
Upon applying the median filter, I realized that aside from the center of the sky, most stars have disappeared in the newly stacked smart object.
So here are my questions regarding my photos:
- If the stars moved significantly between each frame, how can auto-align function properly?
- How can I apply photo stacking to my current set of photos?
- What can I do in the future to prevent this from happening?
Would you guys mind submitting answers so I can reply individually?