|
The dot, if it is well defined is probably a speck on the sensor surface or if slightly blurry on the window ( if there is one ) on the front of the camera.
I've had to use a fine camel hair art brush a few times on the ASI120 to clear a few. It will be so small as to be invisible to the naked eye, only a few micrometers covering a pixel or two. I needed a loupe to see my first one. Now I just get the brush out and carefully wipe across the surface while holding the camera with the lens looking downwards so anything falls away from it.
|