... An update to this handbook is now available. ... Information, software tools, and other resources are available on the WFPC2 World Wide Web page: . URL: http://www.stsci.edu/ftp/instrument_news/WFPC2/top_wfpc2.html . CHAPTER 1: - Introduction . ... 1.2 - Which Instrument to Use: WFPC2, FOC, NICMOS, or STIS? ... 2.7 - Overhead Times . 2.8 - CCD Orientation and Readout . 2.9 - Calibration Channel . CHAPTER 3: - Optical Filters . ... CHAPTER 8: - Calibration and Data Reduction . ...