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| wierdling |
06/06/2009 10:31PM (Read 1480 times)
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Status: offline
Registered: 03/20/2009
Posts: 6
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Greetings all,I am working with data from the ESO WFI, and I have a question about flats. What is the difference between a sky flat and a screen flat? Is a screen flat the same thing as a dome flat?Thanks in advance  James
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| valdes |
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06/06/2009 10:31PM
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 Status: offline
Registered: 11/11/2005
Posts: 728
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Hello James,Yes a screen flat is the same as a dome flat. A sky flat are exposures taken at twilight where any sources that shine through are hopefully removed when multiple exposures are stacked. A sky flat, also called a twilight flat, may do a better job of illumination correction but may also have more problems with gradients from the setting sun and sources.Yours,
Frank Valdes
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