This tutorial will guide you through the process of capturing flat-field frames for astronomical imaging.

Flat-field calibration is used to correct issues such as uneven illumination, sensor dust, and vignetting. There are currently two methods for capturing flat frames:

The first method is the Sky Flat technique, which is recommended for daytime use.

Connect the Seestar to your mobile device and navigate to Seestar Settings > Advanced Feature.

On the Advanced Features page, tap Image Calibration, then select Flat Shoot.

On the Flat Shoot screen, slide the directional control at the bottom to tilt the lens vertically upward. Cover the lens with a sheet of A4 paper.

Once prepared, tap the Shoot button on the right. The Seestar will automatically take the flat-frame image.

Success/Failure: The system will notify you if the capture is successful. If it fails, follow the prompts to retry.

The second method is the Electronic Flat Field Method, which is suitable for iPads or flat-field panels. Set the display device to a pure white background at approximately 80% brightness.

Connect the Seestar to your mobile device and navigate to Seestar Settings > Advanced Feature.

On the Advanced Features page, tap Image Calibration, then select Flat Shoot.

On the Flat Shoot screen, slide the directional control at the bottom to tilt the lens vertically upward, then evenly place the light-emitting device over the lens.

Once prepared, tap the Shoot button on the right. The Seestar will automatically take the flat-frame image.