|Space Telescope Science Institute|
|ACS Instrument Handbook|
10.1 IntroductionThis chapter provides reference material to help you select your filter and detector configuration, and determine your observing plan (e.g., total required exposure time, and number of exposures). This chapter is, for the most part, organized by filter and detector. For each imaging mode the following are provided:
• Plots of the time needed to achieve a desired signal-to-noise ratio vs. magnitude for all filters for a point source and a one arcsecond2 extended source.
• Tables of color corrections ABν to go from Johnson V magnitude to AB magnitude.
The Tables and Figures that are provided in this Chapter may slightly differ from the current results obtained using SYNPHOT. This is due to the fact that several Tables in SYNPHOT have been updated to reflect the latest calibration results. Please contact the STScI Help Desk if you have any questions regarding this subject.