إصلاح الخطأ في منظور صور الأجسام ذات الأضلاع العمودية المتوازية .. كتاب آلة التصوير

Fixed the error in the perspective of images of objects with vertical parallel sides:

This error occurs if the shooting is done with a non-swinging back camera. In either of the following two cases:

(a) When photographing tall objects (such as tall engineering structures), if the camera is positioned at a low position, then the parallel vertical sides are seen in nature and tend to converge at the top of the image (Fig. 132b, 133-1).

(b) When photographing objects whose height is less than the level of the camera. Then you see its parallel or perpendicular sides in nature, and they tended to converge at the bottom of the picture (Fig. 135, page 259).

Although the previous errors are not caused by defects in the lenses or in regular cameras, but rather they are inevitable results of the laws of perspective, but it is always desirable to fix them in photographs, and unless they are done, then the bodies will appear as if they are about to fall, so they do not arouse in the soul of the viewer a feeling stability or stability on the ground. Also, fixing these parallel vertical lines becomes imperative if the purpose of the image is to be used as a basis for engineering measurements or scientific research.

It is easy to fix these errors by using swing-back copiers, observing the following rule:

In order for the vertical or parallel sides in nature to be vertical or parallel also in the image, it is required that the surface of the sensitive film is also perpendicular to the ground, i.e. parallel to the ribs of the body, whether the position of the camera is low in relation to the objects to be photographed (Fig. high in relation to it, Figure 135, page 259).