Special Features:

Opt viewing syst 5.5 in.Dia eye lens 1 opt wide angle 85 degrees angle field of view 27.5 degrees forward of vert opt axis; elec operated ac 115v 400 hz regulated hz 1 phase, dc 28v; vibration isolator mtg; w/o carrying case; w/air circulating and drying syst; w/mtd circ slide rule on instrument panel; access 1 data plate

Properties:

An instrument designed for use in conjunction with aircraft cameras. It provides a clear unobstructed view of the terrain below and in some cases, ahead of the aircraft for the photographer or navigator. It provides a means for determining the correct exposure interval. It may also include optical drift system for determining ground speed or angular drift. Excludes view finder, camera; view finder, camera, television and view finder, camera, photographic.