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Calibration Frames and Image Reduction
Grade Level
Astronomy
AST.089 Calibration Frames and Image Reduction
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A flat frame for a red-filter nebula image should be taken with which filter?
A
Any filter, because flats only measure temperature.
B
The same red filter used for the science image.
C
A blue filter, because it cancels red pixels.
D
No filter, because flats are always clear-light images.
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