Those choices also shape the look: background blur, motion freeze/blur, and clean vs grainy.
Pick what matters most for the shot, then adjust settings (or move to better light) until it looks right.
What you’ll be able to do with this cheat sheet
Get sharp photos by choosing shutter speeds that match the action.
Create background blur for portraits (and keep groups sharp when needed).
Shoot indoors and at night with less frustration by balancing shutter speed and ISO.
Fix exposure fast (too bright / too dark) without guessing.
Make photos look intentional using simple composition and lighting habits.
Exposure Triangle
Exposure is a tradeoff between blur, motion, and grain.
Aperture controls background blur (and also lets in more / less light).
Shutter speed controls motion blur (and also lets in more / less light).
ISO controls grain / noise (and also makes the photo brighter / darker).
Pick the one that matters most for your photo first, then adjust the other two until the brightness looks right.
Distance to subject: closer = blurrier background (shallower focus range).
Focal length (in mm) tells you how wide or tight your photo will look.
Short (e.g., 18–24mm): wide view — fits more in the frame.
Medium (e.g., ~35–50mm): natural everyday view.
Long (e.g., 85–200mm): tight view — makes distant subjects look larger.
Sensor size: larger camera sensor = easier to get background blur.
Top icon: aperture (blur + brightness)
Bottom-left: shutter speed (motion + brightness)
Bottom-right: ISO (grain + brightness)
Fast exposure fixes
Too dark: slow the shutter, open the aperture (smaller f-number), or raise ISO.
Too bright: speed up the shutter, close the aperture (bigger f-number), or lower ISO.
Blurry: raise shutter speed first; then raise ISO if needed.
Grainy: lower ISO, add light, or use a steadier shutter/tripod.
Simple default: start with A/Av mode, pick an aperture, and let the camera choose the shutter speed. Turn on Auto ISO if you have it.
Aperture • Shutter • ISO (plain-English meanings)
Aperture (background blur + light)
Like your pupil: wider lets in more light; smaller lets in less.
Small f-number More light, more background blur
Big f-number Less light, more of the scene in focus
Like blinking: fast “blink” freezes; slow “blink” smears motion.
Action: 1/500–1/2000
Everyday handheld: ~1/125 (faster is safer)
Creative blur: 1/10 and slower (tripod helps a lot)
ISO (brightness boost + grain)
ISO is how sensitive your camera is to light.
Low ISO (100–200): cleaner image, needs more light
High ISO (800–6400+): brighter in dark scenes, more grain/noise
Like turning up sound volume: louder is easier, but adds hiss.
Clean: ISO 100–200
Indoor-friendly: ISO 400–1600
Low light: ISO 1600+ (expect more grain)
Bonus: longer focal lengths tend to blur backgrounds more (especially when you’re close to your subject).
Composition (make photos look intentional)
Rule of thirds: place your subject near a circle point. Keep horizons near a grid line (not cutting the frame in half).
Easy composition wins
Clean background: step left/right to remove clutter behind your subject.
Fill the frame: move closer so the main idea is obvious.
Leading lines: use edges/roads/rails to point toward the subject.
Headroom: don’t leave a big empty gap above a person’s head.
Angle: change height—kneel for kids/pets; shoot slightly above food.
Beginner trap: zooming a little instead of moving your feet. Often the better photo is 2–3 steps closer.
Lighting (the biggest “quality jump”)
Soft light is usually easiest for beginners (gentle shadows). Hard light is dramatic but less forgiving (sharp shadows).
Window light: turn the face toward the window for brighter skin.
Three lights: one main light, a softer “shadow helper,” and a back edge light.
Backlight: great for silhouettes; expose for the face if you want details.
Quick lighting fixes
Harsh sun: move into shade for softer light on faces.
Face too dark by a window: move closer to the window or rotate toward it.
Backlit subject looks dark: use exposure compensation up (+1 to +2) or add a small light/reflector.
“Just tell me what to set” (starter settings)
Use A/Av for most still scenes, S/Tv for action. If you have Auto ISO, it makes learning easier.
Situation
Mode
Aperture
Shutter speed
ISO
Portrait (blurry background)
A/Av
f/1.8–f/2.8
≥ 1/125
100–800
Group photo
A/Av
f/4–f/8
≥ 1/125
100–1600
Landscape (sharp scene)
A/Av
f/8–f/11
≥ 1/125 (tripod if slower)
100–400
Kids/pets running
S/Tv
(auto)
1/500–1/2000
400–3200
Indoor room (no flash)
A/Av
f/1.8–f/3.5
≥ 1/125
800–6400
Night city handheld
A/Av
f/1.8–f/2.8
≥ 1/125
1600–12800
Waterfalls / light trails (tripod)
M
f/8–f/11
1s–30s
100
Handheld tip: try to keep shutter speed at about 1 / (your focal length) or faster (example: 50mm → ~1/50s or faster).
Mobile “Pro” / Advanced Camera (generic guide)
How to find Pro controls
Open your camera app.
Swipe through modes (Photo / Video / Portrait / More).
Look for Pro, Manual, Expert, or RAW.
If you don’t see it, check Settings inside the camera app for “Pro controls” or “Advanced.”
What you can usually control
Exposure (brightness): a slider (often appears after tap-to-focus).
ISO: lower = cleaner; higher = brighter but grainier.
Shutter speed: faster freezes motion; slower blurs (and may need support).
Focus: tap to focus; some phones allow manual focus slider.
White balance: makes light look warmer (orange) or cooler (blue).
RAW: more editing flexibility (files are bigger).
Starter settings (works for most phones)
Bright outdoors: ISO 50–100, shutter 1/250–1/2000.
Indoors (people): shutter ≥ 1/60 (prefer 1/125), raise ISO until it looks bright enough.
Kids/pets: shutter 1/250–1/1000, raise ISO as needed.
Night handheld: try Night mode first; in Pro use shutter 1/15–1/60 + higher ISO.
3 quick “Pro mode” moves
Freeze blur: increase shutter speed → then raise ISO to fix brightness.
Reduce grain: lower ISO → then slow shutter or add light to fix brightness.
Fix weird colors: set white balance (or reset to Auto).
Mobile reality check: many phones don’t offer true aperture control; “Portrait blur” is often a software effect. You’ll still get a big quality jump by controlling shutter, ISO, and light.
Stability tip: for slower shutters, brace your elbows, lean on a wall, or set the phone on something solid + use a 2s timer.
Beginner photography FAQ
What is the exposure triangle?
Exposure is a tradeoff between blur, motion, and grain. Aperture controls background blur and light, shutter speed controls motion blur and light, and ISO controls grain and brightness.
What aperture should beginners use for portraits?
Use a small f-number such as f/1.8–f/2.8 in A/Av mode for a blurry background. Use f/4–f/8 for group photos so more people stay sharp.
What shutter speed should I use for action?
For kids, pets, or other action, use S/Tv mode at 1/500–1/2000. Raise ISO as needed so the photo is bright enough.
How do I fix blurry photos?
Raise shutter speed first, then raise ISO if the photo gets too dark. For handheld shots, try to keep shutter speed at about 1 / your focal length or faster.