Skip to main content
8 votes

What is the physical cause of increasing noise at high ISO?

ISO for Analog vs Digital ISO is confusing in digital photography in part because it was actually meant for film photography. In film photography, ISO 400 really is more sensitive than ISO 100 film. ...
Tim Campbell's user avatar
  • 3,957
4 votes

What is the physical cause of increasing noise at high ISO?

Think of ISO like an amplifier - it increases the gain on the incoming signal. If you have an audio amplifier & an old AM radio tuned to a distant signal, you have to turn up the amp in order to ...
Tetsujin's user avatar
  • 23.4k
2 votes

What is the physical cause of increasing noise at high ISO?

High ISO does not cause more noise. If you take some photos with equal shutter and aperture at different ISO settings, and adjust them to the same exposure in post-processing, you will not find an ...
adrian's user avatar
  • 131
2 votes

Underexposure problem

When you shoot a bird in flight, you are shooting a rather dark object(*) against a light background, so general exposure rules hardly apply. Using auto-exposure is better (this takes in account ...
xenoid's user avatar
  • 21.5k
1 vote

Underexposure problem

If you’re a beginner and only just starting off shooting birds in flight, here are some tips that I recommend which will help you in managing to keep your shutter speed high, ISO low and produce sharp,...
Abdul N Quraishi's user avatar
1 vote

Underexposure problem

Why your exposure was off: There's a handy little rule for proper exposure called "Sunny-16." The rule states that proper exposure in bright sun is equal to: Aperture: f/16 Shutter Speed: 1/ISO (1/...
OnBreak.'s user avatar
  • 20.5k
1 vote

What is the physical cause of increasing noise at high ISO?

Increasing the ISO on a modern digital camera has two effects: It increases the amplification of the sensor signal, making dim parts of the picture brighter. It changes the camera metering so that a ...
Mark Ransom's user avatar
  • 1,495
1 vote

What is the physical cause of increasing noise at high ISO?

Tetsuijn gives already a very good explanation. I try to give a similar explanation but slightly more theoretical. Assume the sensor retrieves the light an all values are between 0 (dark) to 100 (...
Michel Keijzers's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible