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![](https://files.manualsfile.com/19780323-asi294/bg13.png)
ASI294 Manual
19
The big dim spot on the image (at right) are the shadows of dust on the protective window.
The very small but very dark spot in the image (at left) are the shadows of the dusts on the sensor.
The suggested way to clean dust on protective window is try to blow them away with a manual air
pump. To clean the dust on the sensor you will need to open the camera chamber.
We have a very detailed instruction on our website:
https://astronomy-imaging-camera.com/manuals/
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