Principles of silver iodide photography

The principle of silver iodide photography is the principle of optical imaging. Use high-grade writing paper coated with silver chloride to take negative photos, that is, negative films. Positive photos can be obtained by conflicting impressions. As early as the fourth century AD when photography technology had not yet been invented, people began to use projection methods to depict human silhouettes. This has since emerged. The structure of the camera was prototyped, allowing light to pass through a small hole to form an inverted image. Then the small hole was changed into a lens, and a camera obscura was installed. Various parts that could be drawn and imagined were placed on the floor of the camera obscura.

Tips for taking photos

The first is blurring. To put it bluntly, blurring the foreground or background of the photo through shallow depth of field usually blurs the background to give the picture a layer of virtual reality. The blurring effect can further highlight the subject and make your photos more high-end. This is very practical in still life portrait photography. The factors that affect blurring are three-point aperture, focal length and camera position. The larger the aperture, the longer the focal length. The blur effect of the photo is more obvious.

Long exposure is also called slow shutter photography. It uses a slow shutter speed to record the movement of objects. This method can produce wonderful effects that cannot be seen by the human eye. In urban photography, we usually see busy traffic on the road. Appearing as light tracks, this is the result of long exposure. Long exposure also allows us to shoot with low sensitivity in a dark enough environment, which indirectly ensures the clarity of the picture.