Richard Lemieux, 2007-05-24 The purpose of distance calibration is to get correct distance numbers from the camera software. The intent is to be able to compute distance related numbers such as the depth of field and the optimal stereo separation distance. The process of calibration returns parameter values that are used in a program that displays distance related numbers such as program rf_3.c [2]. In the following, I describe the procedure I used to calibrate my A620. Expect to be taking many measurements if you do this procedure.