FOC Instrument Science Report # 077 "The Results of the f/48 DQE Program" by P. Greenfield Abstract excerpted from the report: The f/48 detector was successfully switched on in the interim period between the maintenance and repair mission, and the deployment of the COSTAR corrective optics to run a DQE proposal. Unfortunately, this good news was muted by the appearance of a rapidly increasing background level whic seriously compromised the data quality and threatens the future usefulness of this detector (the background level had reached saturation levels for the larger formats). Nevertheless, it was still possible to do some analysis of the data to get estimates of the DQE of this relat. The general conclusion reached is that the DQE of f/48 appears to be on average about 60% of that predicted over post of the useful bandpass. No evidence was seen for the large discrepancies reported by one GO using the F150W and F130LP filters in the sensitivity for f/48.
