Both metric and non-metric cameras are used in photogrammetry, but the most common use is for non-metric cameras. Since its calibration is very important to calculate the internal orientation elements of the camera, the calibration method is very important. One of the most accurate methods is the pre-calibration method, in which a test field is usually used. There are many types of test fields, some of which are standard and some are locally made. Because of the cost and variety of applications, home-made is used. The test field industry involves many factors such as the quality of the points, their size, and the material the test field is made of. Several types of test fields were tried in this research. The best two models of these types were selected, and then the two models were compared in terms of the effect of the material from which they were made. The effect of the material and choosing the appropriate pattern gave calibration results that reached one-micron accuracy.

Keywords : Camera Calibration; Test Field; Pattern; Material