Bū tools

Exposure

Equivalent exposure: aperture, shutter speed, ISO, ND.

What it does

Keeps the same exposure while you change one setting: open up and the shutter gets faster, add an ND and the ISO goes up…

• Starting exposure: the aperture, shutter speed and ISO that look right (from your light meter or a test shot).
• New exposure: turn the wheels of the triangle (drag, scroll or arrow keys). The wheel in peach, with the lock, adapts on its own; tap another wheel’s name to make it the one that adapts. Under each wheel: the starting value and the gap in stops. Add an ND filter on the right if you use one.
• Each notch is ⅓ stop, like on cameras. Beyond the usual values (a 2-minute exposure, ISO 102,400…), you get the exact value.

The two previews, Start and New, show what changes in the picture: the aperture blurs the background (the lights turn into big soft discs), the shutter speed stretches the moving ball, the ISO adds grain. The brightness stays the same: that’s the point. It’s an indicative rendering, by eye, not an optical simulation.

Depth of field, motion blur and noise change with the settings: the exposure stays the same, not the picture. ND: ND8 = 3 stops, ND64 = 6, ND1000 = 10.

Free, no account, nothing is sent: it runs in your browser, even offline.

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