A pinhole camera<span> is a simple </span>camera<span> without a lens but with a tiny aperture, a </span>pinhole<span> – effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the </span>camera<span> obscura effect.</span>
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Ansel Adams is the photographer who took this picture, he was hired by the Sierra Club to create a book of photographs of American parks. The book was distributed to Congress and successfully convinced its members to pass legislation that would preserve American parks by creating a number of national parks and preserves.