Exposure Triangle Explorer

Pick a scene, then drag inside the triangle. Each edge is an axis for one setting — aperture, shutter, ISO — and the dotted lines read the current values off the edges.

Moving subject (square) on a dotted background

Current settings

Aperture

f/8

Shutter

1/500

ISO

100

Sensor

Physics

Scene illuminance–

Scene EV (ISO 100)–

Photometric H–

Photons / pixel–

How it works: every point in the triangle is a correctly exposed combination — you choose any two settings and the third follows. So you are only picking which artifact to accept: a bright scene gives a small, comfortable triangle (little blur or noise anywhere), while a dim scene forces blur or noise wherever you click. Light is what buys you out of the trade-off.