What is the exposure triangle?

The exposure triangle refers to the three camera settings that control exposure: aperture (f-stop), shutter speed, and ISO. Each setting affects exposure by a measurable number of stops. Doubling or halving any one value changes exposure by exactly one stop.

What is an equivalent exposure?

Two exposures are equivalent when they produce the same overall brightness (EV) on the sensor. For example, f/2.8, 1/500s, ISO 400 is equivalent to f/5.6, 1/125s, ISO 400 — both are the same brightness, but the first has shallower depth of field and freezes faster motion.

How many stops apart are adjacent f-stops?

Standard full-stop aperture values (f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22) are each exactly one stop apart. Each step either halves or doubles the light entering the lens.

How does ISO affect image quality?

Higher ISO amplifies the sensor signal, making the image brighter but also amplifying noise (grain). ISO 100 is the cleanest; ISO 3200+ introduces visible noise, especially in shadows. Always use the lowest ISO that gives a correct exposure.

What does EV (Exposure Value) mean?

EV is a single number that describes the combination of aperture and shutter speed at ISO 100. EV 0 = f/1.0 at 1 second; each stop increase doubles the light needed. Knowing the EV helps you quickly swap equivalent settings.

Can I use this for video exposure?

Yes. The same triangle applies to video. For smooth motion, videographers often follow the 180-degree shutter rule (shutter speed = 2x frame rate), then adjust ISO and aperture to achieve correct exposure.

Exposure Triangle Helper

Name: Exposure Triangle Helper
Availability: InStock
Author: Nham Vu

Dial in aperture, shutter speed, and ISO to find equivalent exposures — instantly see how changing one setting affects the others.

Aperture (f-stop)

Lock

f/5.6

Moderate depth of field

Shutter Speed

Lock

1/250s

Freezes most motion

ISO Sensitivity

Lock

ISO 200

Very clean image

Common Presets

Exposure Value

12.0 EV

Bright overcast / open shade

Stops from EV 0

+12

relative to f/1.0, 1s, ISO 100

Dark (EV 0) Sunny (EV 15)

Exposure Triangle

Find an Equivalent Exposure

Keep the same EV but shift the creative balance. Select which setting to change and enter a new value.

Change setting New value Result

Aperture

Shutter Speed

ISO

Stops Breakdown

Aperture stops

4.0

from f/1.0

Shutter stops

8.0

from 1s

ISO stops

1.0

from ISO 100

Summary

Dial in aperture, shutter speed, and ISO to find equivalent exposures — instantly see how changing one setting affects the others.

How it works

Set your current aperture, shutter speed, and ISO using the controls.
The tool calculates the current Exposure Value (EV) for your scene.
Lock the setting you want to keep fixed, then adjust one of the others.
The third setting auto-updates to maintain the same EV.
The EV display and visual triangle update in real time to confirm the equivalent exposure.
Use the preset cards for common scenarios like portraits, sports, or night photography.

Use cases

Find equivalent exposures when switching from tripod to handheld shooting.
Learn how changing aperture affects depth of field while keeping exposure constant.
Understand the noise trade-off when raising ISO in low light.
Quickly recalculate settings when a subject starts moving and you need a faster shutter.
Study the stops relationship between f-stops, shutter speeds, and ISO values.
Teaching or learning exposure fundamentals in photography classes.
Verify mental math for exposure compensation in the field.
Plan a shoot by modeling settings before arriving on location.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu