Image quality analysis of the UVIS channel during ground testing has shown excellent image performance. Typical encircled energy measurements show 90-92% of the flux from a 250nm point source falling within a diameter of 0.35 arcsec. This decreases with increasing source wavelength, to 85-86% for a 810nm point source.
UVIS Flight Detector
ISR 2005-10:
WFC3 UVIS PSF Evaluation in Thermal-Vacuum Test #1
G. Harting 03 Mar 2005 (Pdf 17948 Kb)
ISR 2004-08:
Preliminary WFC3 UVIS PSF Evaluation
G. Hartig 24 May 2004 (Pdf 151 Kb)