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Master flat field

  1. Mar 11, 2010 #1
    i was given this question, and i can only guess at what the answer is. here it is

    when correcting observed images, why are multiple dome flats (flat field) combined to make a master flat field?

    i know how this is done, but i cant find anything to tell me why it is done.
    i would presume its because this allows you to average pixel values over multiple images meaning any anomalies are discounted.

    (this isn't technically homework, but if it should be moved there then sorry for any inconvenience)
  2. jcsd
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