Common Imaging Issues
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===== Flat Over-Correction ===== ---- * [http://i.imgur.com/ehRlsad.jpg Flat over-correction example] - A flat calibrated frame that is over-corrected will typically show a ring-like vignetting effect. This is often caused by flats that are improperly shot or stacked. Fix: Make certain that your flats aren't over-exposed. When making a master flat, use an average combine; not sigma or other clipping.
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