Behind the lens
A dark room. A strip of film. A camera in your pocket.
Different tools, the same curiosity: how do we hold on to a moment?
01 / The story so far
Pick a moment in time. See what changed—and what never did.
Chapter 01
A camera obscura is a dark space with a small opening. Light from the outside crosses through that opening and projects an upside-down view on the opposite wall. Add a lens, and you can collect more light and focus the image.
The image existed before we could save it.
Science and Media Museum02 / Follow a ray of light
Move the sliders. A wider opening collects more light; a longer exposure also records more movement.
Light collected1.00×relative to the starting settings
An illustrated learning model. Brightness, blur, and grain are simplified; real results also depend on the scene, lens, film, and sensor.
A lower f-number means a wider opening: more light, and usually a softer background.
A longer exposure collects more light. Moving subjects travel farther during that time, creating blur.
Higher ISO brightens the recorded signal and can make noise more visible. It doesn’t add light—watch the light-collected number stay still.
Photodiodes in the sensor turn light into electrical charge. The camera reads the signal, converts it into numbers, and processes them into an image. Repeat the capture many times each second, and you have video.
Try this
Reset the lab. Change from f/4 to f/2: that’s about four times the light. Now shorten the exposure from 1/125s to 1/500s. The brightness returns close to the start, but the background and motion look different.
03 / Your point of view
vlogger.dev is a place for the stories, ideas, and people on the other side of the lens. You don’t need a perfect setup to begin. Find the light. Notice something. Share what you see.
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