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Hubble Space Telescope
FOC Instrument Science Report #076

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.