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Actually that is not quite true Dennis about camera rotation. The only time this is an issue is if you have a flattener that has dust motes on it. The dust on the camera chip which is the most common dust mote you get will always rotate with the camera. Focus will not matter in this case excepting again when you have dust motes on a flattener or reducer.
Flats can be performed just after sunset too. You don't need a light box, just a flat featureless part of the sky is also fine. The white T shirt is also very good too.
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