Calculate Photographic Exposure
A tool to calculate the camera settings for exposure. Enter three values, the forth will be calculated. Aperture, ISO / ASA and exposure time can be set at the camera. EV means exposure value. Different lighting conditions require different EVs, the brighter, the higher is this value. A table with conditions and their approximate EVs is below the calculator. You can enter time at h, m, s as hour, minutes, seconds and then press ← to convert into seconds.
|Full sunlight, snow||16|
|Full sunlight||14 – 15|
|Sunrise / sunset||12|
|Dusk / dawn||5 – 11|
|Night, bright street||7 – 8|
|Inside buildings, artificial light||5 – 8|
|Night, near lighted buildings||5|
|Night, distant lighted buildings||2 – 3|
|Night, dark landscape at full moon||-2|
|Night, dark landscape at half moon||-4|
|Night, dark landscape at new moon||-6 – -8|
|Night, stars||-3 – -9|
|Night, weak celestial bodies, nebulae||-10 and below|
The formula for this calculation is:
EV = log2 ( 100 * aperture² / ( ISO * time ) )
Example: the Milky Way in Cygnus. F-number 3.5, ISO 400, exposure time 1176 s, calculated EV -8.6.
Large image at the Observatory Kempten.
German: Fotografische Belichtung berechnen, Exif-Daten auslesen, Bildformat, Bildverhältnis
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