6XC

Equivalent Exposure Calculator

Change aperture, shutter or ISO and get the setting that keeps the same exposure — stop math done for you.

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Base (metered) exposure

New settings

Required Shutter—
Stop Difference—

The Exposure Triangle

Aperture, shutter speed and ISO trade off in stops: each stop doubles or halves the light. f/2.8 · 1/100 · ISO 100 equals f/5.6 · 1/25 · ISO 100 (two stops less light through the lens, two stops more time). Set your metered base, then change any one value — the calculator returns the compensating shutter speed so the exposure stays identical.

Frequently Asked Questions

I want f/1.8 instead of f/8 — what shutter do I need?

That opens about 4⅓ stops, so shutter must shorten by the same: 1/60 becomes roughly 1/1250. The calculator handles fractional stops exactly.

Is doubling ISO really one stop?

Yes: ISO 100→200 is +1 stop of brightness, equivalent to opening the aperture one stop or doubling the shutter time — at the cost of more noise.

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