Fine Guidance Sensor Instrument Handbook for Cycle 17

Chapter 2: 
FGS Instrument Design

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2.1 The Optical Train
    2.1.1 The Star Selectors
    2.1.2 The Interferometer
2.2 FGS Detectors
2.3 HST's Spherical Aberration
2.4 The FGS Interferometric Response
    2.4.1 The Ideal S-Curve
    2.4.2 Actual S-Curves
2.5 The FGS1r Articulated Mirror Assembly
2.6 FGS Aperture and Filters
    2.6.1 FOV and Detector Coordinates
    2.6.2 Filters and Spectral Coverage
2.7 FGS Calibrations