Chapter 20 — Quiz
Twenty-six self-check questions covering the shutter decision, continuous autofocus, panning, reach and the wildlife approach, anticipating the peak, and the burst-and-cull workflow. A few are seeing questions — you diagnose a described frame. Answer before checking the key; the explanations matter more than the score.
Multiple choice
1. In action photography, which control is usually "the boss" — set first, with the others serving it? a) Aperture b) Shutter speed c) ISO d) White balance
2. You want to freeze a competitive cyclist crossing your frame. The best starting shutter speed is
roughly:
a) 1/60 s b) 1/125 s c) 1/1000 s d) 1/4 s
3. A runner crossing your frame needs 1/1000 s to freeze cleanly. The same runner sprinting straight
toward you at the same speed can be frozen at:
a) A much faster shutter b) The same shutter only c) A slower shutter than 1/1000 s d) No shutter
will freeze a toward-you subject
4. Which focus mode keeps re-measuring and adjusting focus on a moving subject for as long as you hold the button? a) Single AF (AF-S / one-shot) b) Continuous AF (AF-C / servo) c) Manual focus d) Hyperfocal focus
5. Panning produces: a) A blurred subject against a sharp background b) A sharp subject against a streaked background c) Everything sharp d) Everything blurred
6. A good starting shutter speed for panning a cyclist or car is about:
a) 1/2000 s b) 1/500 s c) 1/30 s d) 5 s
7. The "follow-through" in panning means: a) Reviewing the shot immediately b) Continuing to sweep the camera smoothly through and after the shutter press c) Holding the camera perfectly still at the click d) Firing a second burst
8. Beyond making a distant subject bigger, a long telephoto lens also: a) Widens the angle of view b) Increases depth of field dramatically c) Compresses the scene, rendering a clean, soft, distant background d) Slows the shutter automatically
9. The peak of action is best described as: a) The fastest instant of a movement b) The instant a movement hangs at full extension, briefly almost still c) The moment just after the subject leaves the frame d) Whenever the burst happens to fire
10. Why can't you reliably catch the peak by pressing the shutter when you see it? a) The camera's shutter is too fast b) Reaction time plus camera lag (~¼ s) means you fire after the peak has passed c) The buffer is always full d) Autofocus won't lock in time
11. The buffer is: a) The memory card itself b) A protective lens hood c) Fast temporary memory where frames queue before being written to the card d) The continuous-AF prediction system
12. "Spray and pray" — holding the shutter down through a whole event — typically fails because: a) It uses too little of the card b) It fills the buffer (stalling at the worst moment) and buries the keepers in near-duplicates c) It's too slow to catch action d) It disables continuous AF
13. For a phone-only photographer who wants frame-filling wildlife shots, the right strategy is to:
a) Use maximum digital zoom b) Get genuinely close to approachable subjects c) Buy a teleconverter for
the phone d) Always shoot at 1/4000 s
14. The single most important camera setting change when action begins is to switch: a) From JPEG to RAW b) From single AF to continuous AF c) From matrix to spot metering d) From aperture to shutter priority
15. To make a waterfall's water silky while the rocks stay sharp, you use: a) A fast shutter, hand-held b) A slow shutter on a tripod c) Panning d) A long telephoto lens
True / False — justify each in one sentence
16. Freezing every action at the fastest shutter your camera allows always makes the strongest photograph.
17. A subject moving across your frame is harder to freeze than the same subject moving straight toward you.
18. In a pan, the subject is sharp because it is effectively still relative to your sensor while you track it.
19. Cropping a high-resolution file is a perfectly free way to gain unlimited telephoto reach.
20. A higher frame rate (fps) increases the chance that the peak of action lands inside a burst.
Short answer
21. Name the three levers (from Figure 20.1) that together decide whether a moving subject freezes or blurs.
22. Describe, in three or four steps, the physical technique of a clean pan (from foot stance to shutter).
23. State the golden rule of the wildlife approach in one sentence, and give one practical sign that tells you you've broken it.
24. Explain why "acquire the subject early" matters for continuous autofocus (what is the camera doing with that early data?).
Seeing questions — what's wrong, and how would you fix it?
25. A reader shows you this frame and asks why it disappoints them:
text "Daughter's relay race" [described] A teenage runner crosses left-to-right at full sprint. The chain-link fence and the spectators BEHIND her are tack-sharp and perfectly exposed. The runner herself is a soft, smeared blur. Shot in bright daylight; the photographer says they used the same single-focus setting they use for portraits and pressed the shutter when she ran past.Name the two distinct errors and the specific fix for each.
26. Diagnose this one:
text "Panned road cyclist" [described] A cyclist crosses the frame. The cyclist is reasonably sharp. But the background is ALSO sharp — the shopfronts and parked cars behind are crisp and readable, and the photo just looks like an ordinary daylight snapshot of a bike, with no sense of speed at all. The photographer panned smoothly and followed through. They were shooting at 1/640 s in bright sun.The technique was right but one setting defeated it. Name it and the fix.
Answer Key
Show answers and explanations
**1. b)** Shutter speed. Freezing or blurring is the *point* of an action photograph, so you set the shutter first and let aperture/ISO serve it — that's what Shutter Priority is for (§20.1). **2. c)** `1/1000 s`. Crossing competitive cyclists land around `1/1000 s` to freeze the limbs and spokes cleanly (§20.1 Settings Box). **3. c)** A *slower* shutter than `1/1000 s` will suffice. Coming toward you, the subject's image barely crosses the sensor (Figure 20.1, third lever — direction), so much less shutter speed is needed. **4. b)** Continuous AF (AF-C / servo) — it keeps refocusing on the moving subject; AF-S locks once and is for still subjects (§20.2). **5. b)** A sharp subject against a streaked background — you track the subject so it's still relative to the sensor while the background smears (§20.3). **6. c)** `1/30 s` — the classic panning starting point for cars and cyclists; faster and the background won't streak (§20.3). **7. b)** Continuing to sweep smoothly *through and after* the shutter press — like a golf follow-through; stopping at the click is the top cause of failed pans (§20.3). **8. c)** It *compresses* the scene, flattening subject-to-background distance and rendering a clean, soft backdrop — the same property from Chapter 9 (§20.4). **9. b)** The instant a movement hangs at full extension, briefly almost still — the most expressive shape and the easiest to freeze (§20.5). **10. b)** Reaction time plus camera lag (~¼ s) means the shutter opens *after* the peak has passed; you must anticipate and release *before* it (§20.5). **11. c)** Fast temporary memory where shot frames queue before being written to the slower card; when full, the camera stalls (§20.6). **12. b)** It fills the buffer — possibly stalling at the exact peak — and buries your one good frame in hundreds of near-duplicates you must then cull (§20.6). **13. b)** Get genuinely *close* to approachable subjects; a phone's "zoom" is mostly a digital crop that just enlarges mushy pixels (§20.4). **14. b)** From single AF to continuous AF (AF-C/servo) — the single most important camera change in the chapter (§20.2). **15. b)** A slow shutter on a tripod, so the water streaks while the rocks stay sharp (§20.1; developed fully in Chapter 21). **16. False.** Speed you cannot *see* is speed the photograph doesn't have; a totally frozen wave or runner often looks inert. Decide whether the frame wants frozen clarity or visible motion — often *some* blur is stronger (§20.1, Common Mistake). **17. True.** A crossing subject's image travels the most across the sensor; a toward-you subject barely moves across it, so the crossing one needs the faster shutter to freeze (Figure 20.1). **18. True.** Tracking the subject keeps it nearly stationary on the sensor for the exposure, so it records sharp, while the un-tracked background smears (§20.3). **19. False.** Cropping is "free reach" only *within reason* — every crop throws away pixels, so it's a budget you spend, not unlimited free magnification (§20.4 Gear Note). **20. True.** More frames per second means the brief peak is more likely to fall on a frame rather than between frames — which is why fast frame rates are sold to sports shooters (§20.6). **21.** (1) The subject's **real-world speed**; (2) its **size in the frame** (speed × magnification — long lenses/tight crops need faster shutters); (3) its **direction across the frame** (crossing = hardest; straight-toward-you = easiest) (Figure 20.1). **22.** Acceptable answer: **plant your feet; rotate from the hips** (body as a tripod head); **track the subject** in the frame before it reaches you, matching its speed; **squeeze the shutter while still moving and follow through** past the click; use continuous AF and a short burst (§20.3). **23.** "**If your presence changes the animal's behaviour, you are too close** — its welfare outranks the photograph." A practical sign: the animal shows an **alert signal** (head up, body tense, a step away, an alarm call) or stops what it was doing because of you (§20.4). **24.** Continuous AF *predicts* where the subject will be when the shutter actually opens by measuring how its distance changes across several rapid readings; acquiring early gives the system the **motion history** it needs to predict accurately, so the frame is sharp rather than focused where the subject *was* (§20.2). **25.** **Error 1 — wrong focus mode:** they used *single* AF (for portraits), which locked on the background and left the moving runner soft → switch to **continuous AF (AF-C/servo)** and direct the AF-area onto the runner. **Error 2 — timing/technique left the subject blurred even where focus was fine:** a crossing sprinter in single-focus snapshot mode also wasn't tracked → either **freeze** her with a fast shutter (`1/1000 s`+) and continuous AF, *or*, if motion is wanted, **pan** with her. The fix that makes the cleanest keeper: continuous AF + `1/1000 s` + tracking the runner (§20.1–20.2). **26.** The technique was right but the **shutter was far too fast** (`1/640 s`): at that speed the sweep barely drags the background across the sensor, so it stays sharp and the speed vanishes. **Fix:** slow the shutter to about **`1/30 s`** (in bright sun you may need a small aperture, low ISO, or a polarizer/ND to avoid overexposure), then pan and follow through exactly as before (§20.3).Topics to review by question
| If you missed… | Review |
|---|---|
| 1, 2, 3, 15, 16, 17, 21 | §20.1 — the shutter decision and the three levers |
| 4, 14, 24, 25 (error 1) | §20.2 — continuous AF and subject tracking |
| 5, 6, 7, 18, 22, 26 | §20.3 — panning technique |
| 8, 13, 19, 23 | §20.4 — reach and the wildlife approach |
| 9, 10 | §20.5 — anticipating the peak |
| 11, 12, 20 | §20.6 — burst, buffer, and the cull |
| 25 (both errors) | §20.1 + §20.2 combined under pressure |