CamerasIntroductionYou may have to operate cameras in the shop or small-format adjustablecameras in the field. Knowledge of camera types and basic functions ofcamera parts is essential. The theory of operation and maintenanceprocedures for different camera types is similar.Camera theoryCameras are mechanical optical instruments that use light to record latentimages on film or paper. Light, reflected from object surfaces or scenes,enters the camera through a lens. Lenses funnel light through a series ofconvex and concave, optically pure glass until the light reaches the filmsurface. Controlling the amount of light and the length of exposure to lightdetermines how films register light until chemicals develop the image on thefilm.CameramaintenanceAll cameras require maintenance. To keep cameras in your shop in optimumworking condition, you should perform regular camera maintenance. TheNavy Planned Maintenance System (PMS) has PMS cards detailingmaintenance procedures and periodicities. Maintenance on process, copy,and small-format cameras may consist of any of the following actions.Inspect all electrical cords for fraying or bare wire.Check the battery compartment for battery status:is the battery present,is the battery fresh, andis the battery swollen or leaking.Clean optical surfaces with lint-free cloths or chamois.Clean mirrored surfaces with soft camel hair brushes.Remove debris and lint from bellows, copyboard, and film plane.Lightly oil rotating handwheels, cranks, and worm gears.Wipe down camera body with lint-free cloths or chamois.Dust inside film back with soft camel hair brushes.Remove batteries before storing the camera for any length of time.Continued on next page7-4
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