The Exposure Triangle: Light, Time, and Depth
Like Duolingo, but for The Exposure Triangle: Light, Time, and Depth. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
Free forever · No credit card · iPhone & Android
Key ideas in The Exposure Triangle: Light, Time, and Depth
- Aperture acts like a tap's width, controlling the volume of light flow
- Light meters aim for middle gray, often underexposing bright white scenes
- Shutter speed is the duration the tap stays open to fill the sensor bucket
- Intentional overexposure is needed to keep snow or bright skies looking white
- Total exposure is the volume of light collected during the sensor's active window
- The meter measures reflected light, which varies based on subject color
- Light as a finite resource and the 'bucket' analogy for exposure
- The internal light meter as a guide, not a dictator
- Reciprocity allows the same exposure via different setting combinations
- Widening the aperture by one stop requires doubling the shutter speed to stay equal
- Shutter speed priority is essential for freezing or blurring physical motion
- Aperture priority dictates the depth of field and background isolation
- Subject requirements determine which corner of the triangle is 'locked' first
- ISO is typically set first as a baseline for the environment's light level
- Reciprocity and maintaining the same brightness with different settings
- Aperture is chosen next to establish the creative 'look' of the focus
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives The Exposure Triangle: Light, Time, and Depth the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
If you want to increase the volume of light hitting your sensor without changing how long the shutter is open, what should you adjust?
Get it right to open this lesson and 21 more in the app.
Where The Exposure Triangle: Light, Time, and Depth takes you
Move beyond automatic settings by mastering the interplay between aperture, shutter speed, and ISO to capture the exact mood and detail you envision.
- 1
Taking Manual Control
- The Triangle in Action
- Aperture and the Plane of Focus
- Shutter Speed and Motion
- 2
The Math of Light
- Thinking in Stops
- ISO and the Digital Floor
- 3
Creative Problem Solving
- High-Contrast and Low-Light Mastery
- The Sensor's Perspective
3 sections · 7 units · 22 levels. Built to play, not to enroll.
You pick the voice
The Exposure Triangle: Light, Time, and Depth is taught in the The Professor style: clear, structured, thorough. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
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