Many cameras and viewers were developed since then. It was just a matter of time before the two inventions got together, and by the 1850s, stereo-photography became extremely popular. He used drawing to demonstrate it. Then, photography was patented in 1839 by Daguerre and became a gift to humanity by the French government. The stereoscope was invented by the physicist Sir Charles Wheatstone in 1838. That’s why it was called stereoscopy, i.e. When you see those images together, you see a picture in 3D. When you pressed the shutter, two images were taken, each of them with a different point of view from each lens. There was a camera with two lenses separated by 2.5 inches, which is the average distance between human eyes. Stereophotography was based on this principle. See how it seems to move? That’s called parallax, and it’s what allows us to perceive depth. Then close the left eye and look at it with the right one. Close the right eye and look at it only with the left one. Try extending your arm in front of you and hold up one finger. 3D photography is just a new way of referring to a very old technique called stereoscopy – but let me start from the beginning.
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