What is the main purpose of a collimator in aerial photography?

The main purpose of a collimator in aerial photography is to calibrate aerial cameras. A collimator is an optical device that ensures that the camera lens is properly aligned and focused. In aerial photography, accurate image capture is essential for creating reliable maps and models. By using a collimator, surveyors and photographers can adjust the camera settings and positioning to achieve precise imaging that minimizes distortion and ensures that the images accurately represent the ground below. This calibration is vital for maintaining the integrity of the photographic survey, as any misalignment can lead to errors in measurements and data interpretation.

In contrast, developing photographs involves processing the images after they have been captured, which does not involve a collimator. Stabilizing flight paths refers to ensuring the aircraft remains on a steady course, while measuring distance relates to calculations made post-capture rather than the preparation aspect that a collimator addresses.