Quick Start

First of all, if your camera will reduce noises for long-time exposure, suggest to turn it off because it will take long time to process between each shot and there will be long time gaps between the shots. Don't worry about the noises, Sequator can process the noises instead of camera by analyzing noise images.

Aim to the starry sky, you have to take multiple non-blur pictures with proper exposure parameters. There should be some obvious & clear stars on the picture and the picture should be well-focused. Manual focusing, larger aperture, higher but suitable ISO speed, and proper exposure time to make stars clear. For example, I usually use F3.2, ISO 800, 10 sec per frame at 28mm.
After then, cover with the lens cap and take few noise images with the same ISO and exposure time. The noise images are almost fully black. However, we can see few noise pixels on them. These noises are also present on star images and Sequator will eliminate them before stacking. Remember to prepare noise images, otherwise there may be some noises are recognized as stars and affect the stacking result.

Open Sequator after you back to home. You can see the main window of Sequator as follows:

Main window

Double click on "Base image", or right click to open the popup menu, to set a base image. All star images will be aligned and stacked onto the base image. Usually, we will pick the the middle-ordered image of star images as our base image.

Set image

Now we can preview the base image in the right panel. Then add the rest star images by double click "Star image" or select from the popup menu.

Add star images

Add the noise images. We took them with the lens cap. They are almost fully black but few noises can be found on them.

Noise pixels
Noise pixels on the noise image

Assign an output path. TIFF is recommended for post processing.

Set output

We usually suggest to enable the "Auto brightness" or "HDR" function. Otherwise the result may be over-exposed and become totally white if too long exposure time is accumulated. These 2 functions can keep the overall exposure properly. "Auto brightness" will adjust the brightness automatically but allow little over-exposure on ground light. "HDR" will reserve all pixels values in good range but may be lower contrast & brightness, however, suitable for post processing. We only need to enable one of them, here we select "Auto brightness."

Auto brightness

If there is foreground, you must also specify the sky region for better stacking. Finally, click "Start" and wait for a while. Sequator will start processing.


After the processing done, we are able to see the result on the right window. Then you can open the result by the image processing software you are used to.

Process done

Feel too significant light pollution? Save the project and create a new project of Sequator. Assign the output as our new base image, and set another output path. Now we enable the "Reduce pollution." Click Start.

Reduce light pollution

Now the light pollution is reduced and the night sky become more beautiful!

Result of light pollution reduction