How to take flat frames | Support Frames like FLATS can improve your astrophotography images. They correct vignetting and uneven field illumination when used in DeepSkyStacker.... | By AstroBackyard | Facebook
Light box for flats - Beginning Deep Sky Imaging - Cloudy Nights
My DIY flat fields light box / Salvatore Iovene
Easy way to take flats for astrophotography and EAA
Astrophotography 10in EL Panel Circle Flat Frame Kit
DIY large inexpensive flat field panel - DIY Astronomer - Stargazers Lounge