Procedure to film the double perspective of the relief of things (Machine-translation by Google Translate, not legally binding)

摘要

Procedure for filming the double perspective of the relief of things, characterized because it consists essentially of filming through two cameras cameras of the same model and objective, separated horizontally between the optical centers of their objectives by a distance equal to the maximum separation between the eyes, standing these cameras so that the axes of their objectives form an angle by focusing on the same point, center of the main plane, the value of this angle being graduated in inverse ratio to the distance of said plane; at the same time, the two cameras are separated vertically, on their perpendiculars to the common horizontal at the points of the first situation, raising one and lowering another, equally, until there is between each of the objectives and that horizontal a distance of three centimeters, without losing for this the previous convergence in the same and only point, nor therefore the value of the angle formed by the axes; being this separation, like the horizontal, also smaller than what is possible given the size of the cameras, it is obtained by the retraction of these on the axes of their respective objectives, when it is necessary for the best focused, as it usually happens and when this is not the case, by means of telephoto lenses. (Machine-translation by Google Translate, not legally binding)