岡本明才Meisai Okamoto

PINHOLE CAMERA / CAMERA OBSCURA

What Is a Pinhole Camera?

A pinhole camera is one of the simplest photographic devices. Instead of a lens, it forms an image from light entering through a tiny aperture. Because it relies directly on light traveling in straight lines, the image emerges through specific conditions: aperture size, distance and time. This page considers pinhole photography and the relationship between the pinhole camera and camera obscura through principle, structure and expressive possibilities.

01 / DEFINITION

Definition of a Pinhole Camera

A pinhole camera forms an image with light passing through a small aperture instead of a lens. Unlike conventional cameras optimized for sharpness, a pinhole camera makes the conditions of image formation—exposure time, aperture diameter and subject distance—especially visible.

It can therefore be treated both as photographic equipment and as an apparatus for observing the behavior of light and the assumptions behind vision.

Fading Light, an artwork with blue light and a white circular image in darkness
Fading Light / 2021

02 / PRINCIPLE

How the Image Is Formed

A pinhole image is created as light travels in straight lines through the aperture and is projected onto a surface. A larger aperture admits more light but produces a softer image; a smaller aperture tightens the image but requires a longer exposure. This trade-off between image and time is fundamental to the pinhole camera.

Aperture diameter
Affects image sharpness and brightness
Projection distance
Affects image size and brightness
Exposure time
Determines whether the image can be formed

03 / STRUCTURE

Minimum Structure

A pinhole camera has three essential elements.

  1. 01A light-tight box: a space that controls light
  2. 02A pinhole: the entrance for light
  3. 03A light-sensitive surface: film, photographic paper or an image sensor

This structure can be enlarged easily. A larger box becomes a giant camera; if a building or room is made light-tight and an aperture is opened, the space functions as a camera obscura.

04 / CAMERA OBSCURA

Relationship to Camera Obscura

A camera obscura is a dark room with a small aperture—or sometimes a lens—that projects the outside scene onto an interior wall. A pinhole camera can be understood as a portable form of the camera obscura.

They are not separate principles, but points on a continuum distinguished by scale and use. A pinhole camera is a small darkroom; a camera obscura is a large pinhole camera.

05 / EXPRESSION

Pinhole Photography as Expression

Pinhole photography is more than simply “retro” or “soft.” By stepping away from the lens-based values of resolution and focus, it can make the conditions through which an image appears into the subject of the work itself.

  • The image appears as a set of conditions: time, distance and aperture
  • The idea of a single focus weakens and the space becomes more even
  • Designing the apparatus becomes part of the act of making

06 / FAQ

Frequently Asked Questions

Can I make a pinhole camera myself?

Yes. A pinhole camera can work with three elements: a light-tight box, a pinhole and a light-sensitive surface. The precision of the aperture and the exclusion of stray light are essential to a stable image.

What is the difference between a camera obscura and a pinhole camera?

They share the same principle. A camera obscura is a room-scale dark space for experiencing a projection, while a pinhole camera is a portable photographic apparatus that records an image.

Why do pinhole photographs look soft?

With a larger aperture, light from multiple directions overlaps and softens the image. A smaller aperture produces a tighter image, but requires a longer exposure and becomes more susceptible to movement.