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adhesive adjustment aircraft aluminum amplitude ANVIS aperture aspheric astigmatism attenuation baseplate beryllium binocular birefringence camera cell centration clamps coefficient collimation components crystal light crystal light valve damping damping ratio defects diameter display effect element eyepiece fiber field fixture flexure mount focal focus glass hard mount housing image intensifier inch input interface wave isolation system lenses liquid crystal liquid crystal light located machining manufacturing measured mechanical Micro-5 minimize mirror mount mirror surface Ml9 binocular module mount approach mounting pads natural frequency Night Vision Night Vision Goggle operation optical alignment optical axis optical system OPTOMECHANICAL SYSTEM output performance polarized porro prism primary mirror prism assembly production projector radial ratio Recon/Optical requirements rotational sagitta secondary mirror shown in Figure space spherical aberration spherometer spindle spring structure surface error techniques telescope thermal tilt tolerances transmissibility tube typesetter ultrasonic vertical vibration wavelength xenon arc lamp