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Optical Systems for Astronomical PhotographyBaker
High Vacuum EquipmentBrown
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adjustment aluminum amateur amplifier angstroms approximately astigmatism astronomical axial Barlow lens beam binocular calculated cemented center of curvature chromatic chromatic aberration clear aperture collimator color coma concave construction convex correcting lens correcting plate crown curve diameter diffraction diffusion pump disk distance edge elements equation eyepiece field film filter flat flint focal length focal ratio focus Foucault test fringes gage glass grating grinding holder hole inch instrument knife-edge lens lenses light measured metal method microscope mirror mounted objective obtained ocular operation optical axis paraboloid parallel photographic pinhole placed plane polishing position prism quartz radii radius of curvature ray tracing reflected refraction refractor Ri Wi right angle rotation Schmidt camera screw shown in Figure side slide slit spectra spectrograph spectrum spherical aberration spherometer square star surface Table telescope thickness tion tool tube usually vacuum wavelength wire zone