Causes of Dimensional Changes in Estar Base Aerial Film Under Simulated Service Conditions

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Abstract
Dimensional changes were studied in five rolls of Estar base film exposed in both routine and simulated survey operations in a Wild RC8 camera. The simulated operations, with ambient conditions controlled and intentionally varied, enabled causes to be established for the various types of size change observed. The source of the most serious dimensional changes is low relative humidity in the camera compartment. This is a common condition in a heated aircraft cabin when the outside temperature is low. Ways of minimizing dimensional changes are recommended. To approach the potential geometrical accuracy of cameras, humidity control is needed in the aircraft.

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