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Photography began as a chemistry problem. Lenses had been projecting sharp images for centuries — artists traced them inside darkened rooms — but nobody could make the projection stay. Nicéphore Niépce finally fixed one in 1826, on a pewter plate coated with bitumen, after an exposure that ran for hours. The view from his window at Le Gras is blurry and almost unreadable, and it is also the oldest surviving photograph.

From a plate to a roll

For its first fifty years the medium belonged to specialists, because every picture required wet chemistry on the spot. Daguerreotypes were one-of-a-kind objects on silvered copper; collodion plates had to be coated, exposed, and developed before they dried, which is why frontier photographers traveled with entire darkroom wagons. George Eastman broke that bottleneck in 1888 with a box camera sold preloaded with flexible roll film. The slogan — “You press the button, we do the rest” — described a mail-order developing service, but what it really announced was that making a photograph no longer required a chemistry bench. Snapshots, family albums, and the whole vernacular record of the twentieth century followed from that one piece of packaging.

What a camera actually records

A photograph is a measurement of light over time. Film counted photons with silver halide crystals; a digital sensor counts them with photodiodes, but the grammar is unchanged — aperture, shutter speed, and the sensitivity of the medium still trade against one another, and every picture is a compromise among the three. What digital capture changed was the cost of failure. A photographer in 1950 rationed thirty-six frames per roll; one today can expose thousands and choose later. Critics still argue about whether that abundance made the average photograph better or simply made photographs more numerous.