The screenshot-and-re-read card for exposure. Skim it before any shoot. If you remember only one sentence: in video the shutter is pinned, so balance brightness with ISO, aperture, and ND — and judge it on a scope, not your eye.
The core definitions
Term
In one line
Exposure
The overall brightness of the image — how much light was collected and how strongly it was amplified.
A stop
One doubling or halving of light — the shared currency of every exposure control, which makes them interchangeable.
ISO
Amplification of the captured signal (not more light). Higher = brighter and noisier.
Native (base) ISO
The ISO where the sensor is cleanest and holds the most dynamic range — not always the lowest number.
ND filter
Neutral-density "sunglasses for the lens": removes light evenly, no color/motion/focus cost.
Exposure triangle (video)
The classic ISO/aperture/shutter triangle with the shutter pinned by the 180° rule — so you balance with ISO, aperture, and ND.
Waveform
A live graph of brightness, black (0) bottom to white (100) top; the main exposure scope.
Zebras
Diagonal stripes painted on live image areas past a set brightness threshold.
False color
A brightness heat-map recoloring the whole frame; best for placing skin precisely.
The locked triangle — which lever, what it costs
Lever
Use it to…
Side fee
When to reach for it
Shutter
(nothing — it's pinned)
Wrecks motion if moved
Never for brightness. Set to 180° and leave it.
ND filter
Darken in bright light
None
First, when there's too much light.
Aperture
Set the look (depth of field)
Shallower/deeper focus
To choose background separation; brightness is a side effect.
ISO
Brighten in low light
Noise
Last, only when you've run out of light.
The one-currency rule: a stop is a stop everywhere. Lose a stop in one place, hand it back one-for-one somewhere else — no arithmetic.
The repeatable exposure workflow (the checklist)
Run this top-to-bottom, every time. Goal: under a minute.
[ ] 1. Lock the foundation. Frame rate → 180° shutter (1/50 s @ 24 fps). Shutter is now pinned.
[ ] 2. Set ISO to native/base. Your camera's cleanest point.
[ ] 3. Choose aperture for the story. Pick the depth of field the shot wants (e.g. f/2.8 for soft background).
[ ] 4. Balance brightness — on a scope, not your eye.
Too bright → add / increase ND.
Too dark → (a) open aperture, (b) add light, (c) raise ISO last.
[ ] 5. Place the subject, protect the highlights. Skin in the upper-middle (~60–70); nothing important pinned at 0 or 100.
[ ] 6. Lock it and note it. Manual (or AE lock). Write down ISO / aperture / ND / shutter so every shot matches.
The ND ladder (three names, one darkness)
Stops
ND number
Density
Light through
Typical use
1
ND2
0.3
1/2
Slightly bright / overcast trim
2
ND4
0.6
1/4
Bright shade
3
ND8
0.9
1/8
Bright overcast / hazy sun
4
ND16
1.2
1/16
Sun
6
ND64
1.8
1/64
Full bright sun at f/2.8, 1/50 s, base ISO
~10
ND1000
3.0
~1/1000
Extreme / long-exposure effects
Fixed vs variable: fixed = cheapest, most neutral, swap glass. Variable = dial on the fly, but watch for a dark "X" and color cast at the extremes. Phone: clip-on ND + a manual app to pin the shutter.
ND / ISO decision table (too much or too little light)
Situation
Symptom on the waveform
Do this
Bright sun, want f/2.8 + 1/50 s
Trace pinned at 100
Add ND (often ~6 stops). Don't touch shutter or aperture.
Bright, but you can spare depth of field
Trace high
Close aperture a stop or two and/or add ND.
Indoors, well-lit
Trace healthy
Stay at native ISO; small aperture/ND tweaks.
Dim room, aperture already wide
Trace low, image dark
Add light first, then raise ISO only as needed.
Dark, no lights available
Trace low
Raise ISO (last resort) until usable; accept some noise.
Placing this face's skin exactly (learn your camera's colors)
Exposing Log — the short version
Never judge Log by eye — it's deliberately flat and grey and hides how close the highlights are to clipping.
See the truth with a monitoring LUT (previews the normal look while recording flat) or false color / waveform.
Protect the highlights — clipped is fatal, underexposed shadows are recoverable (at a noise cost).
Expose to your camera's published Log targets (middle grey + white card) — look them up once, note them.
"Expose to the right" (rate a touch brighter) cleans shadow noise — but stop before any important highlight or skin approaches clipping. Highlights always win.
Top mistakes → the fix
Mistake
Fix
Fixing a bright shot by speeding the shutter
It's pinned by the 180° rule — use ND instead.
Cranking ISO to avoid lighting/opening up
Native ISO first; ISO is the last resort. Noise is baked in.
Judging exposure on the (bright, punchy, adapting) screen
Judge on a scope — waveform, zebras, false color.
Brightening Log until it "looks normal"
Blows highlights. Use a LUT or scope + the camera's targets.
Letting the highlights clip
Protect them — they never come back. Err dark.
Auto-exposure "breathing" mid-shot
Lock exposure (manual / AE lock).
Leaving ND on when you move indoors
Take it off — or fight needless noise.
One "correct" skin value for every face
Meter the actual skin tone; place it with false color.
Story & craft principles this chapter serves
Story is the boss. Exposure tells the viewer how to feel — bright and open, or dark and hidden (see The Godfather, Case Study 1). Brightness is a storytelling variable, not just a technical target.
Motivate every choice. Deliberate low-key ≠ accidental underexposure. If you let something go dark, be able to say why. Motivation is your defense against "we can't see anything."
You shoot for the edit. Consistent, locked, noted exposure = shots that match in the cut and a gradeable image. Exposure that drifts = hours of repair in color.
Project 1 increment
Expose a Project 1 test clip on a scope; lock and note ISO, aperture, and ND. Set up your talking-head, run the six-step workflow, judge on the waveform/zebras/false color, place the skin, protect the highlights, lock it, and write the recipe onto your shooting card. Every later Project 1 shot must match this exposure.
The phone path, in four lines
Use a manual/"pro" video app to pin the shutter near 1/50 s and set a low ISO.
Bright out? Clip on an ND (don't let the phone crank the shutter and strobe the motion).
Expose to the app's waveform/histogram/zebras; place the skin; protect highlights.
Lock it (tap-and-hold AE/AF lock or the app's manual mode) so brightness can't drift.
One-line connections
Shutter / 180° rule / sensor — Chapter 2. Aperture / depth of field — Chapter 4. Log / dynamic range — Chapter 3.
Lighting the interior, high-/low-key, window as key — Chapters 11–13 (the Café Scene interior is where you'll protect a window highlight for real).
The full scope suite (parade, vectorscope), matching shots, correction & grade — Chapters 31–32. Software menu translations — Appendix E.