When was the first camera invented in France?

1822, the Frenchman Niepce made the world's first photo on the photosensitive material, but the image was not clear and needed eight hours of exposure. In 1826, he took a photo through a black box on the tin floor coated with photosensitive asphalt.

1838, French physicist Daguerre was studying the method of preserving images on objects, but after a long time of research, it was still pointless. One day, he suddenly found an image left on the object, so he removed the nearby chemicals one by one to see what caused this phenomenon. As a result, he found that the "great hero" was actually the mercury left after a thermometer broke-photography was born.

In Daguerre, the silver plate photography method is to expose the steel plate coated with silver iodide in a black box, then develop it with mercury vapor and fix it with salt. This method is actually a negative metal image, but it is very clear and can be preserved forever. Because the exposure time takes about 20 to 30 minutes, early photography often takes pictures of still lives, landscapes and portraits.

1839 On August 9, 2009/kloc-0, at the joint gathering of the French Academy of Sciences and the Academy of Fine Arts, the French government announced that it would give up the invention patent of silver plate photography and make it public. People usually take this day as the beginning of photography.

1839, Daguerre made the first practical silver camera, which consisted of two wooden cases. One wooden box is inserted into another to focus, and the lens cover is used as a shutter. Only by controlling the exposure time for 30 minutes can a clear image be taken.