Light Captured: A History of Photography

Before the Camera: Dreaming of Captured Light

Imagine living in a world where the only way to preserve someone's face was to paint it. Where the only way to remember a place was to sketch it from memory. Where everything you saw would eventually fade, existing only in your mind until your mind itself was gone.

That was the world before photography.

For thousands of years, humans could only dream of capturing light. But the dream was powerful, and people kept trying.

❝

"We have no certainty as to who first invented the art of painting... Some say it originated in Egypt, others among the Greeks. The Greeks claim that it was invented at either Sicyon or Corinth. All agree, however, that it began with tracing an outline around a man's shadow."

The desire to capture what we see is ancient. But the technology to actually do it took centuries to develop, and it required understanding something fundamental: light itself.

The Camera Obscura: A Room That Sees

The story begins with a simple observation: if you make a tiny hole in the wall of a dark room, an upside-down image of the outside world will appear on the opposite wall.

This is the camera obscura—Latin for "dark room." The principle is simple: light travels in straight lines. Light from the top of a scene travels through the pinhole and hits the bottom of the wall. Light from the bottom travels through and hits the top. The image inverts.

❝

"If the image of the sun at the time of an eclipse—provided it is not a total eclipse—passes through a small round hole onto a plane surface opposite the hole, it will be crescent-shaped... The light of the sun only appears in this crescent shape when the light passes through the hole; it does not appear when the light reaches the wall through a wider aperture."

Artists quickly realized the camera obscura could help them draw more accurately. Instead of trying to translate three dimensions into two, they could trace the projected image. Some historians believe Vermeer and other Dutch masters used camera obscuras. The projected images helped them capture perspective, proportion, and the subtle play of light.

But there was a problem. The image vanished the moment you stopped looking. It was there, and then it was gone. Light could be bent and focused, but it couldn't be held.

Could it?

Silver and Light: The Chemistry of Memory

The breakthrough came from chemistry, not optics.

In 1727, a German professor named Johann Heinrich Schulze made a curious discovery. He noticed that a mixture of chalk, nitric acid, and silver darkened when exposed to sunlight. The more light hit it, the darker it became.

This was extraordinary. Light was leaving a permanent mark on matter. It wasn't just passing through—it was changing things.

Over the next century, scientists experimented with these "silver salts." They learned that silver nitrate, silver chloride, and silver iodide all reacted to light. They could make paper or leather turn dark by coating it with these chemicals and placing it in sunlight.

The problem? They couldn't stop the process. Once exposed, the material kept darkening until it turned completely black. They could capture an image, but they couldn't keep it.

Niepce and the First Photograph

18261826

Nicephore Niepce was a French inventor obsessed with the idea of "automatic" image-making. He called his experiments "heliography"—writing with the sun.

After years of failed attempts with silver salts, Niepce tried something different: bitumen of Judea, a naturally occurring asphalt that hardens when exposed to light. He coated a pewter plate with this substance, placed it in a camera obscura, and waited.

And waited. The exposure took at least eight hours—possibly several days. When he washed away the unhardened bitumen with lavender oil and petroleum, what remained was a ghostly but permanent image: the view from his workroom window.

This was the first photograph. It still exists, preserved at the University of Texas. It shows rooftops and a courtyard, barely recognizable after two centuries. But it was a miracle: light had been frozen.

❝

"I placed the apparatus in the room where I work, facing the birdhouse... I obtained the picture of whatever was before the window that could be seen from outside and a faint image of the window frames."

But Niepce's process was impractical. Hours-long exposures meant you could photograph buildings but not people (who would move). The images were faint and required special lighting to see. The process was difficult to replicate.

Photography needed someone who could make it work for everyone.

Daguerre and the Daguerreotype

18391839

Louis-Jacques-Mande Daguerre was a theatrical scene painter known for his dioramas—elaborate visual spectacles that used lighting effects to create illusions. He became Niepce's partner in 1829, and when Niepce died in 1833, Daguerre continued experimenting alone.

In 1835, Daguerre made a discovery by accident. He had placed an exposed silver iodide plate in a cupboard, planning to clean and reuse it. When he retrieved it days later, the faint image had somehow become visible. Daguerre tested everything in the cupboard until he identified the cause: mercury vapor from a broken thermometer had "developed" the image.

This was the key breakthrough. Instead of waiting for light to slowly darken silver salts, you could give a brief exposure, then amplify the result with chemical development. Exposure times dropped from hours to minutes.

❝

"It seems to me not a little remarkable, that an art destined, no doubt, to produce such great effects upon the world, should have been discovered in the retirement of our closets; and that the first idea of arresting the rays of the sun in their passage through our atmosphere should have occurred to a painter of theatrical decorations."

On January 7, 1839, the French Academy of Sciences announced Daguerre's process to the world. The French government bought the patent and made it a "gift to the world" (though Daguerre had actually patented it in England five days earlier). The daguerreotype was born.

The process worked like this:

1. A copper plate was coated with silver and polished to a mirror finish
2. The plate was exposed to iodine vapors, creating light-sensitive silver iodide
3. The plate was exposed in a camera for several minutes
4. Mercury vapor was used to develop the image
5. The plate was fixed with a salt solution to stop further exposure
6. The fragile image was sealed behind glass

The results were stunning—impossibly detailed images that seemed to capture reality itself. People had never seen anything like it.

❝

"We have much pleasure in announcing an important discovery made by M. Daguerre, the celebrated painter of the Diorama... The discovery seems like a dream. It would be too much to say that it surpasses anything that the human imagination could have conceived."

Fox Talbot and the Negative

Across the English Channel, another inventor was furious.

William Henry Fox Talbot was an English scientist, mathematician, and gentleman scholar. He had been working on his own photographic process since 1834, and when he heard about Daguerre's announcement, he rushed to establish his own priority.

Talbot's process was different from Daguerre's in one crucial way: it produced a negative.

When Talbot exposed paper coated with silver chloride, the areas that received the most light turned dark. The result was a reversed image—a negative—where light areas appeared dark and dark areas appeared light.

This seemed like a problem. But Talbot realized it was actually an opportunity. If he placed the negative against another sheet of sensitized paper and exposed it to light, he got a positive image. And from one negative, he could make unlimited copies.

❝

"The plates of the present work are impressed by the agency of Light alone, without any aid whatever from the artist's pencil. They are the sun-pictures themselves, and not, as some persons have imagined, engravings in imitation."

Talbot patented his process (called the calotype or talbotype) and tried to control it through licensing. This slowed its adoption—the daguerreotype, freely available, spread faster. But Talbot's negative-positive system would ultimately win. It's the principle that underlied all film photography until the digital age.

Photography for Everyone

Early photography required technical skill, specialized equipment, and careful handling of dangerous chemicals. Exposure times were measured in minutes. Every photograph was precious because every photograph was difficult.

Then, in 1888, a former bank clerk from Rochester, New York changed everything.

18881888

George Eastman had spent years developing a way to replace fragile glass plates with flexible film. His company, Eastman Kodak, introduced the first Kodak camera—a simple box camera that came pre-loaded with enough film for 100 pictures.

The advertising slogan said it all: "You press the button, we do the rest."

❝

"A collection of these pictures may be made to furnish a pictorial history of life as it is lived by the owner, that will grow more valuable every day that passes... The Kodak camera makes possible a personal collection of photographs without the trouble of learning a complicated art."

For the first time, ordinary people could take photographs. You didn't need to know chemistry. You didn't need a darkroom. You just pointed the camera and pressed a button.

Photography became democratic. Family snapshots, vacation pictures, casual portraits—an entirely new kind of image emerged. Photography was no longer just for professionals and wealthy amateurs. It was for everyone.

The 35mm Revolution

19251925

The next revolution came from miniaturization. In 1913, a German engineer named Oskar Barnack built a prototype camera that used 35mm motion picture film. It was small enough to fit in a pocket, yet produced images of remarkable quality.

The Leica camera, introduced commercially in 1925, changed photography again. Small and quiet, it allowed photographers to work unobtrusively, capturing candid moments rather than posed tableaux.

❝

"To me, photography is the simultaneous recognition, in a fraction of a second, of the significance of an event as well as of a precise organization of forms which give that event its proper expression."

The small camera enabled new kinds of photography: photojournalism, street photography, documentary work. Photographers could move through the world almost invisibly, waiting for what Cartier-Bresson called "the decisive moment"—that instant when composition, gesture, and meaning all align.

The Digital Revolution

In 1975, a Kodak engineer named Steve Sasson built a contraption that weighed eight pounds, took 23 seconds to record a single black-and-white image, and stored that image on a cassette tape. It was the first digital camera.

Digital photography replaced film's chemical reaction with an electronic one. Instead of light causing silver salts to darken, it caused electrons to accumulate in tiny photosites on a sensor. These electrical charges could be converted into numbers, and numbers could be stored, transmitted, and processed by computers.

The transition was slow at first—early digital cameras were expensive and produced images far inferior to film. But by the mid-2000s, digital had won. Film became a niche medium for artists and enthusiasts.

And then came the smartphone.

The iPhone, introduced in 2007, put a capable camera in billions of pockets. Today, over 1.4 trillion photographs are taken every year—more than all the photographs taken in the entire 150-year history of photography before digital.

Think about that. In the time it takes you to read this sentence, millions of photographs are being taken around the world. Light is being captured on a scale that Daguerre could never have imagined.

What Did Photography Change?

Photography didn't just give us a new way to make pictures. It changed how we see, how we remember, and how we understand the world.

Photography changed memory. Before photography, memory was personal and fleeting. Now we have visual records of moments, places, people. Family photographs preserve faces that would otherwise be forgotten. Historical photographs let us see the past with our own eyes.

Photography changed truth. We say "the camera never lies," but of course it does—through selection, framing, timing, and manipulation. Yet photographs still carry a sense of authenticity that drawings and paintings don't. We believe photographs in ways we don't believe other images.

❝

"Photographs furnish evidence. Something we hear about, but doubt, seems proven when we're shown a photograph of it... A photograph passes for incontrovertible proof that a given thing happened. The picture may distort; but there is always a presumption that something exists, or did exist, which is like what's in the picture."

Photography changed seeing itself. We now see the world through photographic eyes—framing scenes, noticing lighting, looking for "the shot." Photography taught us new ways of paying attention.

Photography raised new questions. Can photographs be art? (This was hotly debated for decades.) Who has the right to photograph whom? What should never be photographed? What happens when everyone has a camera?

These questions will stay with us throughout this course. Photography isn't just a technical skill—it's a way of engaging with fundamental questions about seeing, truth, and representation.

The Camera in Your Hand

Today, you probably carry a device more photographically powerful than anything Daguerre, Talbot, or even Ansel Adams ever used. Your smartphone can take dozens of photographs per second, adjust exposure automatically, and share images instantly with anyone in the world.

But all those technological advances don't change the fundamental challenge: making photographs that matter.

Technology can help you capture light. It can't tell you what's worth seeing. It can't tell you when to press the button. It can't tell you what a photograph means.

That's what this course is about: not just how to use a camera, but how to see.

❝

"The invention of photography provided a radically new picture-making process—a process based not on synthesis but on selection. The difference was a fundamental one. Petrarch climbed Mt. Ventoux and saw Italy, but he could not bring it back. Photography changed that."

Assignment: Light Writing

The word "photography" comes from Greek roots meaning "light writing." For this unit's assignment, you'll explore what it means to write with light.

Part 1: Build a Camera Obscura or Pinhole Camera

You can experience the fundamental principle of photography directly by building your own camera obscura or pinhole camera.

Option A: Room Camera Obscura

• Find a room that can be made completely dark
• Cover the windows with black paper or cardboard
• Make a small hole (about the size of a pencil) in the covering
• Wait for your eyes to adjust and observe the inverted image on the opposite wall
• Document what you see (describe it or sketch it)

Option B: Pinhole Camera

• Build a simple pinhole camera from a cardboard box or can
• Photograph a scene using photographic paper (if available) or observe the image on a translucent screen
• Research instructions for building a pinhole camera appropriate to your materials

Part 2: Sketch vs. Photograph

Choose a simple scene—a view from a window, a corner of a room, a still life arrangement.

1. Sketch it as carefully as you can for 15-20 minutes
2. Photograph it with whatever camera you have available
3. Write a short reflection (200-300 words) comparing the two experiences:
   • What did you notice while sketching that you might have missed while photographing?
   • What did the camera capture that your sketch couldn't?
   • What does each image communicate that the other doesn't?

Part 3: Research a Pioneer

Choose one early photographer to research:

• Nicephore Niepce
• Louis Daguerre
• William Henry Fox Talbot
• Julia Margaret Cameron
• Nadar (Gaspard-Felix Tournachon)
• Oscar Rejlander
• Roger Fenton

Write a brief profile (300-400 words) covering:

• When and where they worked
• What was distinctive about their approach
• One significant image they created and why it matters
• What question about photography did their work raise?

Vocabulary

• Camera obscura: Latin for "dark room"; a darkened enclosure with a small hole that projects an inverted image of the outside scene
• Daguerreotype: The first practical photographic process, producing a unique image on a silver-coated copper plate
• Calotype/Talbotype: Fox Talbot's paper negative process, the ancestor of all negative-positive photography
• Negative: An image in which tones are reversed—light areas appear dark and dark areas appear light
• Positive: An image with tones matching reality—light areas appear light and dark areas appear dark
• Exposure: The amount of light that reaches the light-sensitive material (film or sensor)
• Development: The chemical process that makes a latent (invisible) image visible
• Fixing: The chemical process that makes an image permanent by removing unexposed silver salts
• Silver salts/Silver halides: Light-sensitive chemical compounds (silver chloride, silver bromide, silver iodide) used in film photography
• Sensor: In digital photography, the electronic device that converts light into electrical signals

Discussion Questions

1. Photography was once called "sun painting" and "light drawing." What do these names suggest about how people understood the medium?

2. The French government made the daguerreotype a "gift to the world" in 1839, while Fox Talbot patented his process. How might the history of photography have been different if both processes had been free, or both had been patented?

3. The Kodak slogan "You press the button, we do the rest" promised to remove technical difficulty from photography. Was something gained or lost in that simplification? What is gained or lost when smartphone cameras do even more for us automatically?

4. Susan Sontag wrote that "photographs furnish evidence." Do you agree? What makes a photograph feel like evidence in a way a drawing doesn't?

5. More photographs are now taken every two minutes than were taken in all of the 1800s. What does this mean for how we see, remember, and communicate?