I’ve built a DIY dedicated flat field panel using a repurposed LED light fixture. The flat field panel is a light source with relatively uniform brightness. The panel attaches directly onto my telescope and can be used for taking flat frames.
With a DIY flat field panel, the unevenness in the illumination of the field such as vignetting and presence of dusts are revealed. When a flat frame is applied to an image, any variation in brightness or illumination across the frame is leveled out (flattened), thus, vignetting and dusts are removed from the image.
Here’s a sample photo with and without flats calibration frames applied.
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Night Sky in Focus © Anthony Urbano | Bacoor, Philippines
Night Sky in Focus 