Friends who know photography technology can help me take a look.

Camera obscura: If light is reflected from a bright scene and enters a dark room through a small hole, a dim image of the scene can be formed on the wall opposite the scene. This image is upside down because light from the upper part of the object can only illuminate the lower part of the wall, and light from the lower part can only illuminate the upper part of the wall. This is the principle of what is known as the camera obscura. However, as early as 1593, the painter Bella Porta of the Kingdom of Naples took advantage of this phenomenon and copied engravings. Porta set up a light-shielding wooden board in a room with weak light. A small hole called a "pinhole" was drilled into the wooden board. The light-facing side of the wooden board faced the picture to be copied, so that the hole was aligned with the picture; the light penetrated The small hole shines on a piece of white painting paper indoors, revealing the image of the painting. At this time, the painter can trace the outline of the print on the paper. Later, people renovated the darkroom and reduced it to a camera obscura, using a magnifying glass or telescope instead of the pinhole to make the image clearer; a tilted reflector was installed in the camera obscura to reflect the image onto a horizontal piece of glass on the top of the box. Place a piece of translucent drawing paper on the glass. The camera obscura is an auxiliary tool for painters. In the 18th century, camera obscura was very popular, and various camera obscura came into being, including table-type ones, sedan-type ones, and folding-type ones; the big ones required two people to carry them, while the small ones could be placed in the palm of the hand. The invention of the camera obscura laid a certain foundation for the advent of the camera.

Zoom photography: While pressing the shutter, change the focal length of the "zoom lens". The subject is clear while the background is blurred, creating a strong dynamic effect.

The image distance is of course adjustable