Work out exposure triangle balance instantly with clear inputs, formula shown and shareable results.
The settings are converted to an ISO 100 exposure value and compared with the metered scene EV, so the difference is the error in stops. Because all three controls trade in stops, an error can be corrected by whichever leg matters least to the picture, and the shutter figure shows one such fix.
Settings EV
EV100 = log2(aperture^2 / shutter) - log2(ISO / 100)
Correction
corrected shutter = current shutter x 2 ^ (settings EV - metered EV)
EV100 = log2(aperture^2 / shutter) - log2(ISO / 100). The settings are converted to an ISO 100 exposure value and compared with the metered scene EV, so the difference is the error in stops.
Because all three controls trade in stops, an error can be corrected by whichever leg matters least to the picture, and the shutter figure shows one such fix.
Enter aperture, shutter speed, iso, metered scene ev at iso 100. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.