조리개, 셔터스피드, ISO 간 동등 노출을 계산하세요. 클릭 한 번이 정확히 1스톱이며, 분수 스톱 지원과 EV 표 출력을 제공합니다.
| 다음을 변경하면… | 노출을 맞추려면 다음을 조정하세요… |
|---|
각 "스톱"은 빛의 양이 두 배 또는 절반이 되는 것을 의미합니다. ISO를 두 배로 올리거나, 조리개를 한 스톱 개방하거나, 셔터 속도를 두 배로 늘리면 모두 한 스톱씩 증가합니다. 동등한 노출을 유지하려면 ISO 스톱 + 조리개 스톱 + 셔터 스톱의 합이 일정해야 합니다.
ISO 100 기준 EV = log₂(N² / t), 여기서 N은 조리개값, t는 셔터 속도(초)입니다. 카메라 다이얼의 조정 단위에 맞춰 1/3 스톱 단위로 조정합니다.
The headline figure is exposure value at ISO 100: EV = log₂(N² ÷ t), where N is the f-number and t is shutter time in seconds. The default f/8 at 1/125 s gives EV 12.96. Underneath, the Δ from base readout counts stops of brightness relative to the ISO 100 · f/8 · 1/125 reference by summing log₂(ISO ÷ 100), log₂(64 ÷ N²) and log₂(t × 125) into a single signed number.
The three dropdowns are ladders of genuine camera values: ISO 50 through 102400 and apertures f/0.95 through f/32 in third-stop increments, shutter speeds 30 s down to 1/8000 in whole stops. Changing one axis moves another to hold the exposure matched, and the Lock ISO, Lock Aperture and Lock Shutter buttons take that axis out of contention — click again to release. Reset (ISO 100 · f/8 · 1/125) returns everything to the reference.
Check the compensating value against your camera before you shoot. The tool snaps to the nearest ladder entry, and because shutter is a whole-stop list while ISO and aperture are thirds, a third-stop change can round away to nothing on the shutter axis. It is also pure light arithmetic: no reciprocity failure, no ND filters, no T-stop transmission losses, and no accounting for the depth of field and diffraction that separate f/1.4 from f/16.
It is log₂(N² ÷ t) for the default f/8 at 1/125 second — a measure of how much scene light that combination is set for, roughly bright overcast daylight. Higher EV means a brighter scene, and each whole number is one full stop.
Four times faster. Each stop doubles the light, so two stops is a factor of four: f/8 at 1/125 becomes f/4 at 1/500. ISO could absorb the same change instead, dropping from 400 down to 100 for an identical result.
The shutter list follows the classic camera dial, 30 s down to 1/8000 with each entry double the last. ISO and aperture use third-stop ladders instead. A one-third change on either can therefore round back to the same shutter value.
They pin one axis so it will not be moved when you change another, and clicking a second time releases it. Use Lock ISO when your camera sits at a base ISO you want to keep, or Lock Shutter to protect a motion-freezing speed.
Yes, at the same shutter speed. Doubling ISO adds a stop and opening f/8 to f/5.6 adds another, so both combinations land at the same brightness. They differ in noise and depth of field, neither of which this calculator models.
Crop Factor & Equivalent Focal Length Calculator
Convert focal length and aperture between sensor sizes — Full Frame, APS-C, M43, 1" and medium format.
Hyperfocal Distance & Depth of Field Calculator
Calculate hyperfocal distance and near/far DOF limits for any focal length, aperture and sensor size.
Video Bitrate & File Size Calculator (H.264, H.265, AV1)
Calculate video file size from bitrate, resolution, FPS and duration for H.264, H.265, AV1 and ProRes.
