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Field distortions

The plate scale of FLAMINGOS-2 ranges from 0.1792 arcsec / pixel on-axis to 0.1787 arcec / pixel at the outermost radius. Even though modest, these distortions must be taken into account when coadding sets of dithered images to avoid image degradation.

Fig.: Optical distortions (plate scale variations) for FLAMINGOS-2, determined with Scamp from 85 dithered Ks-band observations of a dense stellar field.  Note that the corners are extrapolated, because they do not contain data due to the circular field-of-view. The small spatial offset of the distortion pattern from the center of the square detector array is real. 

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