... Near Infrared Camera and Multi-Object Spectrometer Instrument Handbook for Cycle 17 > Chapter 4: Imaging > 4.4 Image Quality . ... 4.4.3 NIC3 . ... The ratio is very high, between 0.8 and 0.9 for NICMOS images, at all wavelengths and in all Cameras at their optimal focus. ... For NIC3, the quoted Strehl ratio is for optimal focus measurements obtained during the Cycle 7 & 7N campaigns. ... The changes in dewar geometry leading to the degraded focus in NIC3 have also affected NIC1 and NIC2. ...