Camera Settings — The Manual Mode Triangle
MANUAL mode lets you take total control of your camera. Three settings work together to control how much light reaches the sensor (the EXPOSURE) — they're called the EXPOSURE TRIANGLE. APERTURE: the size of the lens opening (f-numbers like f/1.8, f/4, f/16 — smaller numbers = bigger opening). SHUTTER SPEED: how long the sensor sees light (1/1000s, 1/30s, 5s). ISO: the sensor's sensitivity to light (100, 800, 6400).
Each has a TRADE-OFF. APERTURE: small numbers (f/1.8) = bright photo with blurry background; large numbers (f/16) = dim but everything in focus. SHUTTER: fast (1/1000s) freezes motion but is darker; slow (1/30s) is brighter but motion blurs. ISO: low (100) = clean image; high (6400) = grainy but works in dim light. Adjusting one means adjusting another to keep the right exposure.
You want to photograph a fast-moving bird. The shot is too dark at fast shutter speeds. What other settings can you adjust?
Practical settings to start. PORTRAITS: aperture f/2.8-f/4 for soft background, ISO 100-400, shutter 1/200s+. ACTION/SPORTS: shutter 1/500s+ to freeze motion, aperture as wide as needed, ISO as needed. LANDSCAPES: aperture f/8-f/16 for everything sharp, ISO 100, shutter as long as needed (use a tripod). NIGHT: aperture wide, ISO high, slow shutter. Modes called Aperture Priority (A or Av) and Shutter Priority (S or Tv) automate two settings while you control one — great for learning.
Manual Practice
Use a phone with manual mode (or a real camera). Pick a stationary subject. Photograph it at: low ISO + wide aperture + fast shutter. Then high ISO + narrow aperture + slow shutter. Same subject, totally different look.
Manual mode at first feels like flying a plane. With practice, it becomes second nature — and your photos go from "what the camera decided" to "exactly what you saw."
Want to keep learning?
Sign up for free to access the full curriculum — all subjects, all ages.
Start Learning Free