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Flats are important to fix dust and also to even out vignetting. It is very easy yo do with a digital camera. I do then at the end of my session after I have parked the scope and turned the mount off. I put a T shirt over the front of the scope, turn the lights on in the nearby room and aim the scope at the lights by releasing the clutches. I take 7 frames with the camera set to auto. Each one is about 1 sec exposures. It doesn't really matter as long as they are not too long to need dark frames. Then average the frames in your favorite processing software.
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