FOC Instrument Science Report #076 "FOC f/96 Detector Focus" by P.E Hodge and M. Miebach Abstract excerpted from the report: Observations of NGC 104 (47 TUC) were used to determine the optimum first-stage voltage for the FOC f/96 image intensifier. A voltage of 10.69 KV was found to give the sharpest images, while the default voltage was 11.25 KV. The brightness in the central pixel was 15 to 20 percent greater at the optimum voltage.
