Comparison of the predicted redundancy with the experimental MTF (estimated from the modulus of the Fourier transform of F190N images of calibration star SAO 179809) for two models: the first (top panel) assumes that the aperture is that of the HST Optical Telescope Assembly (OTA) and the second (bottom panel) takes into account the misaligned cold mask of the NICMOS camera. While the redundancy of the first model fails to reproduce the modulus of the Fourier transform that was effectively measured from the image, the second model convincingly matches the fine features of the instrument MTF.