Deep-sky stacking is a process that combines multiple individual frames of a deep-sky object after capture. This stacking process significantly improves the signal-to-noise ratio, resulting in a much clearer final image.
To use this feature, navigate to the Seestar Gallery. Please ensure your Seestar is powered on and connected to the app beforehand.
First, click on the "Deep Sky Stack" on the homepage to enter the "Deep Sky Stack" function, and click the "Add Images" button.
Enter the deep sky images and select the deep sky target you want to overlay. After entering the target folder, select multiple images. When selecting images, try to pick frames that are not overexposed, contain the full target, and are free from obstructions, star trailing, airplane trails, or satellite streaks. After selecting, click "OK".
After clicking "OK", you can preview the selected images, and you can also click the "Edit" button in the upper right corner to filter the images again.
Only one deep sky target can be selected for each deep sky stack. If you want to select other targets, you need to clear the currently selected target image first, and then select other target images. Click the "Edit" button in the upper right corner to select all images, and click Delete to clear the images.
After the image is confirmed to be correct, click the "stack" button to start the deep sky overlay.After waiting for the stack to be successful, click "Check now" to view the image after the overlay is completed.
If stacking fails, the last selected image will still be displayed. You can filter out qualified images for stacking again.
Tips:
You may notice that the stacked deep-sky image and the real-time enhanced image appear rotated in different directions.
This happens because real-time enhancement aligns all frames to the first sub-exposure, while deep-sky stacking aligns them to the last sub-exposure. Due to field rotation caused by Earth’s rotation, the alignment order is reversed between the two methods, which makes the images appear rotated differently. This is completely normal and does not affect the quality of the final image.