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Camera exposure value
Compare aperture, exposure time and ISO using setting EV and its ISO-100 equivalent.
Aperture (f-number): 0.7–64; Exposure time (s): 0.000001–3600; ISO sensitivity: 25–409600
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Camera exposure value
Aperture (f-number): 4 Exposure time (s): 0.02 ISO sensitivity: 400
- Setting EV
- 9.643856
- ISO-100 equivalent (EV100)
- 7.643856
Setting EV = log₂(N² / t), where N is the f-number and t is exposure time in seconds. ISO-100 equivalent EV100 = setting EV − log₂(ISO / 100). Enter seconds as a decimal: 1/50 s = 0.02 s, not 50; use the actual f-number, not the aperture diameter. Supported ranges are f/0.7–f/64, 0.000001–3600 s and ISO 25–409600, including fractions. One EV is one stop; doubling exposure time lowers setting EV by one, while doubling ISO lowers EV100 by one without changing setting EV. Equal EV100 values describe nominal exposure equivalence after ISO adjustment, not equal depth of field, motion blur, noise or dynamic range. This is a camera-settings calculation, not a light-meter reading, measured scene luminance or an automatic exposure recommendation. It excludes lens transmission/T-stops, ND filters, exposure compensation, flash, sensor calibration and reciprocity failure. Check the camera, waveform/histogram and real lighting. Display uses six decimals without intermediate rounding.
Methodology
How it works
Setting EV = log₂(N² / t), where N is the f-number and t is exposure time in seconds. ISO-100 equivalent EV100 = setting EV − log₂(ISO / 100). Enter seconds as a decimal: 1/50 s = 0.02 s, not 50; use the actual f-number, not the aperture diameter. Supported ranges are f/0.7–f/64, 0.000001–3600 s and ISO 25–409600, including fractions. One EV is one stop; doubling exposure time lowers setting EV by one, while doubling ISO lowers EV100 by one without changing setting EV. Equal EV100 values describe nominal exposure equivalence after ISO adjustment, not equal depth of field, motion blur, noise or dynamic range. This is a camera-settings calculation, not a light-meter reading, measured scene luminance or an automatic exposure recommendation. It excludes lens transmission/T-stops, ND filters, exposure compensation, flash, sensor calibration and reciprocity failure. Check the camera, waveform/histogram and real lighting. Display uses six decimals without intermediate rounding.
Method and assumptions documented by Techrider.live
2026-10-30
Frequently asked questions
Does a higher EV mean a brighter recorded picture?
Not by itself. At fixed ISO, a higher setting EV admits less nominal exposure. EV100 normalizes the settings for ISO; actual picture brightness still depends on the scene, processing and camera behavior.