The one-page reference for night and long-exposure photography. Screenshot this and re-read it before you
head out after dark. The big idea in one line: when the light fails, lock the camera down and use time
as your light — the still world stays sharp while the moving world becomes ribbons, veils, and arcs.
The core definitions
Term
In one line
Long exposure
Any frame where the shutter stays open long enough that motion shows as blur/streak/smoothing (roughly ½ s to hours).
Bulb mode (B)
Shutter stays open as long as you hold the release — for exposures past the usual 30-second limit.
The 500 rule
Longest shutter for point (non-streaked) stars ≈ 500 ÷ focal length (35mm-equiv) in seconds.
Light trail
The continuous line a moving bright light (car, bike, plane) draws across the frame during a long exposure.
Light painting
Building a dark scene's lighting by hand — sweeping a handheld light over the subject during the open shutter.
Star trail
The curved arc each star draws over a very long (or many stacked) exposure, recording the Earth's rotation.
Long-exposure noise reduction (LENR)
Camera shoots an equal-length "dark frame" and subtracts its hot-pixel pattern; costs you a second exposure of the same length.
The night-exposure routine (run it every time)
☐ Tripod up, on solid ground. Legs locked; weight the strap/centre column if breezy.
☐ Stabilization OFF. (On a tripod it hunts and softens.)
☐ Don't touch the camera firing it — 2-second timer or remote release.
☐ Focus manually on a bright distant light (magnified live view) — or AF then flip to MF — or set
hyperfocal. Never trust AF in the dark.
☐ Shoot RAW. Maximum latitude to rescue shadows and fix colour.
☐ Shoot a test frame; read the HISTOGRAM, not the glowing rear screen.
☐ Adjust one variable, re-shoot. Raise ISO last.
Settings starting points (a place to begin — the histogram decides the rest)
Situation
Mode
Aperture
Shutter
ISO
Focus
Must-have
Light trails (traffic)
M
f/8–f/11
8–30 s
100–200
MF on distant light
Tripod + actual flowing traffic
Smoothed water
M / A
f/8–f/16
½–10 s
100
MF / hyperfocal
Tripod (ND filter in daylight)
Sharp star field
M
f/2.8 (wide open)
≤ 500/FL s
1600–6400
MF on bright star
Dark site + wide fast lens
Star trails
M
f/2.8–f/4
many × 30 s, stacked
800–3200
MF on bright star
Time + stacking later
Light painting
M / BULB
f/8
15–60 s+
100
MF pre-set on subject
Handheld light + darkness
Blue-hour city
M / A
f/8–f/11
1–10 s
100
MF / hyperfocal
Be there the right ~20 min
The two rules that explain everything
Rule 1 — The separation. A tripod separates the still world from the moving world: the road/shore/
ground stays razor sharp while the traffic/water/stars blur. You cannot have one sharp and one flowing
without nailing the camera down.
Rule 2 — What time does to motion. Anything bright that moves draws a line (a trail). Anything
textured that moves turns to mist (smoothing). Choose the duration to match the motion you want to
draw.
Reading the night histogram
You see…
It means…
Do…
A big pile against the left wall
Normal — the scene really is mostly dark
Nothing; night should look like night
A spike jammed against the right wall
A bright light is clipped to featureless white
Shorten shutter or close aperture
Important midtones (wall, rocks) at pure black
Shadows crushed, no recoverable detail
Slow shutter or open aperture (raise ISO last)
Bright, gorgeous rear-screen preview
The screen lies in the dark
Trust the graph, not the glow
The 500 rule at a glance (point stars)
Focal length (35mm-equiv)
Longest shutter ≈
14mm
35 s
20mm
25 s
24mm
21 s
35mm
14 s
50mm
10 s
Wider lens → longer allowed shutter → more starlight gathered before streaking. Halve these (the "300
rule") for crisper points on high-resolution sensors.
Decision aid: which night technique?
If you want to show…
Reach for…
Key control
The flow/pattern of moving traffic
Light trails
8–30 s shutter + timed release to traffic
Silky/misty water or streaking cloud
Smoothed motion
½–10 s (try a range; too long erases form)
How much is in the night sky
Sharp star field
500-rule shutter, wide aperture, high ISO, dark site
That the planet is turning
Star trails
many × 30 s frames, stacked, aimed at the pole
Light exactly where you choose, from nothing
Light painting
dwell time of a handheld light
The city at its most balanced and beautiful
Blue hour
being set up at the right ~20–40 min after sunset
Top mistakes → fixes
Mistake
Fix
Image stabilization left on (soft frames on a tripod)
Turn IS/VR off when locked down
Firing with a finger on the shutter (shaken exposure)
2-second timer or remote release
Trusting autofocus in the dark (whole night soft)
Manual focus on a bright light; confirm in magnified live view
Over-exposing to "fix" a left-heavy histogram
Let night be dark; expose for unclipped lights + midtone detail
Firing on an empty road ("trails" with no trails)
Time the release to flowing traffic; anticipate the flow
Smoothing water until it's featureless fog
Try a shorter shutter (½ s) that keeps a hint of form
One giant exposure for star trails (noisy, sky-glow)
Many shorter frames, stacked afterward
Raising ISO first
ISO is the last lever — exhaust shutter and aperture first
Arriving at blue hour with nothing set up
Scout in daylight; tripod up before sunset
Phone-only quick path (📱)
Brace it rock-steady — phone tripod, clamp, railing, wall, or beanbag. The principle is identical:
make the camera not move.
Use Night mode — it fakes a long exposure by stacking many short frames (the machinery is Chapter 23).
Best for blue hour, low-light streets, and even surprising starfields from a dark site.
A long-exposure app holds a true long shutter (or stacks) for real light trails and smoothed water.
Tap to set exposure/focus, drop exposure compensation so the lights don't blow, and fire with the
timer so you don't shake it.
Blue hour is your strongest phase — phones handle the balanced sky-and-lights beautifully with almost
no effort.
How this connects (cross-references)
Lean on
For
§3.3 (shutter & motion), §3.5 (the triangle), §3.6 (histogram)
The shutter is your night lever; its motion side-effect is the aesthetic
§4.6 (hyperfocal distance)
Focusing a landscape lens in the dark so foreground-to-stars is sharp
§5.2 (raking/side light), §5.4 (blue hour)
Light painting reveals texture; blue hour is night's prime time
§6.2–§6.3 (power points, leading lines)
Compose the road/river as a leading line to a destination
§7.2 (complementary contrast)
Warm city lights against the cool blue-hour sky
§10.2 (anticipation)
Timing the shutter release to the flow of traffic
§11 (off-camera flash, the red door at night)
The other way to place light in a dark scene
Ch.23 (stacking, Night mode) — preview
What your phone does automatically to fake all this
Portfolio Checkpoint (this chapter's deliverable)
Add one long-exposure or night image to the Portfolio — light trails, a star field/trail, smoothed
water, a blue-hour cityscape, or a light-painted subject. One deliberate, tripod-made frame where
something that moved is recorded as flowing light or smoothed motion and the still parts are sharp.
Label it 21-night; note which technique you used. Why it belongs: every prior keeper was made in
light you could see — this one was made in light you couldn't, and shows the viewer something no eye can
witness. Curation note: set it beside your Chapter 5 golden-hour keeper — together they prove you can
find the magic light and keep making singular images long after it's gone.