A discussion of various means for improving visibility from the DSRV Alvin or similar vehicles
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Plots of distortion and lateral chromatic aberration of plan ports for underwater viewing are given. Optical characteristics of window materials are discussed. Various simple lens and mirror systems to correct the window aberrations and/or give a wider field of view are evaluated. Unless infinity viewing system (those that project a field of view to both eyes) or more conventional internal telescopes or binoculars are employed the observer or pilot must crouch with face very close to the window to perceive a wide field. Because of the great volume required for the optics of infinity viewing systems, binocular telescopes with eyepieces are thought to be more practical means for increasing pilot and observer comfort. it is shown that hemispherical pressure windows are required for high performance scanning systems and a layout for such a system is given.