Depth of Field and Aperture
Like Duolingo, but for Depth of Field and Aperture. 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.
A short one: 9 levels across 2 sections, about 18 minutes end to end, roughly 4 days at five minutes a day. It moves through Sculpting Subject Isolation and Mastering Full-Frame Sharpness. It assumes you already know the basics.
Free forever · No credit card · iPhone & Android
Key ideas in Depth of Field and Aperture
- Moving closer to the subject compresses depth of field faster than changing f-stops
- Pushing the subject farther from the background accelerates background blur
- A large subject-to-background distance relative to camera distance melts clutter
- Wide-open apertures at close range create a depth of field mere millimeters thin
- Angling a portrait subject pulls one eye outside the razor-thin focus plane
- Stopping down slightly ensures both eyes stay within acceptable sharpness
- Depth of field extends roughly twice as far behind the focus plane as in front
- Foreground objects blur substantially faster than background objects at equal offsets
- Non-linear focus falloff makes foreground framing elements lose definition rapidly
- Lenses suffer from optical aberrations wide open that soften fine contrast
- Stopping down one to two stops maximizes resolution and cleans edge fringing
- Lens barrel rims physically clip angled peripheral light rays at wide apertures
- Mechanical clipping squeezes round specular highlights into cat's-eye shapes
- Stopping down eliminates edge clipping, restoring round or polygonal discs
- Narrower fields of view crop in on and blow up background blur circles
- A longer lens magnifies out-of-focus background patches across the frame
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 Depth of Field and Aperture 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.
Your lens is wide open, but the fence behind your friend is still distracting. What should you do?
Get it right to open this lesson and 8 more in the app.
Where Depth of Field and Aperture takes you
Move beyond basic auto mode and take intentional control of your frame's depth. Learn how f-stops, subject distance, and focal lengths combine to isolate subjects or keep entire landscapes tack-sharp.
- 1
Sculpting Subject Isolation
- Controlling Blur with Distance Ratios
- Lens Choice and Plane Geometry
- 2
Mastering Full-Frame Sharpness
- Hyperfocal Distance and Deep Focus
2 sections · 3 units · 9 levels. Built to play, not to enroll.
You pick the voice
Depth of Field and Aperture is taught in the The Bestie style: your friend who just gets it. 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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Start Depth of Field and Aperture today.
Download Tomo, search Depth of Field and Aperture, and play your first lesson in under a minute.