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hi iamp;#39;m fred brunges owner of daystar filters iamp;#39;m going to show you how to turn this train wreck of a solar image into this using flat fields but first letamp;#39;s talk about what often goes wrong in solar imaging dust spots can show up on the camera sensor filter uv ir cut filter focal reducer or anywhere in the rear part of your setup these dark spots are best avoided by keeping your equipment sealed tight as much as possible but a flat field can work very well to hide them another common problem is vignetting where the aperture of the filter or an adapter is smaller than your camera short of getting a larger aperture solar filter flat feeling can reduce the impact because daystar uses naturally grown mica crystals some variation in brightness across the field of view is possible but again a flat field does wonders to level these out and make even entry level filters perform like a better research grade p e filter costing over ten thousand dollars all solar filters h