The NICMOS distortion was measured by a series of images of the star cluster NGC1850. In each camera 5 images were taken, displaced from each other without rotation. The displacements known from the telescope movements were paired with corresponding movements of star images on the detector to calculate the solution. The degree of distortion was very small, amounting to about a one pixel shift at the corners. The pixel axes depart measurably from orthogonality being at most 0.2 degrees acute on camera 1. 1
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