Traditional Culture Encyclopedia - Photography major - Principle and characteristics of pinhole imaging
Principle and characteristics of pinhole imaging
When a wooden board with a small hole is blocked between a wall and an object, the reflection of the object will be formed on the wall. We call this phenomenon pinhole imaging. Moving the middle board back and forth will change the size of the image on the wall, which shows the nature of light propagating along a straight line.
Some cameras and video cameras use the principle of pinhole imaging-the lens is a pinhole, and the scene enters the darkroom through the pinhole, just like being left on the film by a special chemical.
The conclusion of pinhole imaging experiment is that light travels in a straight line in the same homogeneous substance. When the image distance is constant, the closer the object distance, the larger the image and the brighter the brightness; The farther the object distance, the smaller the image and the darker the brightness. When the object distance is constant, the close-up image of the screen becomes smaller and brighter; The screen looks bigger and darker. When the position of the object, hole and screen remains unchanged, imaging is the premise, and the image becomes brighter when the hole is relatively large.
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