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Dust can be removed easily by a dry bulb blower and any stubborn bits can be removed by gentle cleaning the CCD wit Isopropyl alcohol, then blowing clean with a dry bulb blower.
Flat frames will remove a lot of artifacts and any vignetting during software pre processing.
To take flats you need to have an even diffuse light source that will allow you to take evenly lit frames which can be applied to your light frames to reduce these problems.
Give me a call or drop in and I will show you how to do it the easy way.
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