Is pinhole imaging a clearer image as you look at the hole?

A long time ago, someone wanted to keep all kinds of scenes for a long time. In the 4th century A.D., the method of depicting people's outline by projection was popular for some time. Later, people used pinhole imaging method to get the image of the scene. Then someone changed the pinhole into a lens, and the prototype of the camera was formed. With the development of modern science and technology, the functions of the camera and the materials used in its production are constantly improving and perfecting. However, both the early wooden box camera and the latest digital camera are developed from the simplest pinhole imaging principle.

Open a small hole in the front end of the opaque black box, and install a photosensitive film at the other end of the black box. The reflected light of the subject enters the black box through the small hole, and is imaged on the negative, so you can take pictures. (The principle is as follows) Pinhole imaging does not need focusing and has no aberration. Like the human eye looking at the real thing through a small hole, the visual effect is natural, the photos are soft and realistic, with a strong sense of space and rich layering. The disadvantage is the long exposure time.

Our understanding of pinhole imaging can be traced back to the Spring and Autumn Period and the Warring States Period in China. Mo Zhai's Mo Jing recorded the phenomenon of pinhole imaging and made an incisive explanation. He is the earliest expositor of pinhole imaging in the world. During the Northern Song Dynasty, Shen Kuo did many experiments on the basis of previous studies on pinhole imaging, and his book Meng Qian Bi Tan recorded pinhole imaging in detail. He made a small hole in the paper window, so that the shadow of the tower flying kites outside the window could be imaged on the paper curtain indoors. He pointed out: "... if a kite flies in the air and its shadow moves with the kite, or is tied with a window in the middle, the kite is connected with the shadow, the kite is in the west and the kite is in the east. For example, the window gap is the shadow of the tower, and it is tied by the window in the middle, which is also upside down ... "

1620, Austrian J. Kepler made a portable black box. /kloc-in the 0/8th century, the camera box was fitted with a lens and became a mirror box, which was the prototype of the camera. (Schematic diagram at the bottom right) 18 12, the crescent-shaped lens of William Hyde Wallaston, England, improves the luminous flux of the mirror box. In 1839, Daguerre invented a camera for silver plate photography, which was made of double wood structure, with a length of 10.5 inch, a height of 125 inch and a weight of1/0.0 pound. The lens consists of two wollaston crescent lenses, and the mirror box can be gathered back and forth. The following two photos were taken by Hu Dayi with a homemade pinhole camera.