|STIS Instrument Handbook for Cycle 25|
The F28X50LP mode is useful for deep imaging longward of 5500 Å. The field of view is 28x50”. The ACS/WFC with the F814W filter will be more appropriate for most programs.Recommended for deep high-resolution imaging between 5500 Å and 10,000 Å. Default aperture for target acquisitions.
Pivot λ (Å) Speak Bλ R80 (arcsec) Figure 14.7: Throughput for F28x50LPTable 14.4: F28X50LP Sensitivity & Throughput
Figure 14.8: Point Source S/N vs. V+ABν for the F28X50LP filter. Top curves are for low sky; bottom curves are for average sky. Curves are labeled by required exposure time (seconds).Figure 14.9: Extended Source S/N vs. V+ABν for the F28X50LP filter for gain=1. Top curves are for a source area of 0.2 arcsec2; bottom curves are for 1 arcsec2. Average sky assumed. Curves are labeled by required exposure time (seconds).Table 14.5: Radial Profile for F28X50LP
Figure 14.10: Point Source Encircled Energy for F28X50LPFigure 14.11: Point Source Intensity vs. Radius for F28X50LP