Raise the ISO

Watch brightness climb and noise appear together.

ISO 400
100 200 400 800 1600 3200 6400+
Brightness
Noise
Clean image quality
The trade-off

Higher ISO = brighter frame, more noise. Each stop doubles sensitivity. ISO is the last dial you turn, not the first.

ISO Quick Reference

Range, noise level, and typical shooting conditions

ISO Noise Best For
100–400 Base ISO Clean Bright daylight, studio flash, tripod landscapes
800–1600 Low Overcast, indoor window light, golden hour
3200–6400 Moderate Indoor events, dusk, dim restaurants
12800+ High Concerts, night street, astrophotography
Field note

A noisy photo beats a blurry one. Noise reduces in post; motion blur does not. Push ISO before dropping below your minimum shutter speed.

Raise ISO Last

Set aperture and shutter first; ISO fills the gap

  1. Set aperture

    Wide for blur and low light (f/1.8–f/2.8). Narrow for depth (f/8–f/11). This choice is hard to undo in post.

  2. Set shutter

    Meet your motion and handheld minimum. Sports 1/1000s+. Handheld floor = 1/focal length.

  3. Still underexposed?

    Raise ISO one stop at a time until the meter balances. Check the table above for acceptable noise at each level.

  4. Configure Auto ISO

    Let the camera adjust in changing light, but set guardrails.

    Max ISO 3200–6400 Min shutter 1/250s Min ISO 100

Cheat Sheet

Quick answers for the field

Too dark? Open aperture first, then raise ISO. Do not drop shutter below your motion minimum
Too noisy? Lower ISO, add light, or use a tripod and base ISO
Sunny day? ISO 100–200. No reason to go higher outdoors
Indoor event? ISO 3200–6400, f/2.8, 1/250s minimum
Concert? ISO 6400–12800, f/2.8, 1/250s+. Accept the grain
Landscape on tripod? ISO 100 always. Use shutter speed for exposure, not ISO
Noisy or blurry? Choose noisy. Sharpen and denoise in post; blur is permanent
Auto ISO limits? Max 6400 for events, min shutter 1/250s to protect motion

Common Questions

Quick answers on base ISO, noise, Auto ISO, and when to push sensitivity.

What is ISO in photography?

Sensor sensitivity to light. Higher ISO brightens the image but adds noise. Each stop doubles sensitivity: ISO 400 is twice as sensitive as ISO 200.

What ISO should I use?

Start at base ISO (100 or 200). Raise only after aperture and shutter are set. Bright sun: ISO 100–400. Indoor events: ISO 3200–6400.

Does higher ISO reduce image quality?

Yes. Higher ISO adds grain and reduces dynamic range. Modern cameras stay usable to ISO 6400; beyond that, noise becomes obvious.

Should I use Auto ISO?

Yes for changing light. Set a maximum ISO (3200 or 6400) and a minimum shutter speed so the camera does not sacrifice motion control.

Keep Learning

The other two sides of the exposure triangle