Calculate Exposure | Exif Viewer | Photo Dimensions | Photo Ratio | Image Diagonal

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.

Aperture f-number (ƒ/):
Time (s): = h m s


Lighting condition EV
Full sunlight, snow16
Full sunlight14 – 15
Thick clouds12
Sunrise / sunset12
Dusk / dawn5 – 11
Night, bright street7 – 8
Inside buildings, artificial light5 – 8
Night, near lighted buildings5
Night, distant lighted buildings2 – 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 ) )

The larger the aperture value, the smaller the aperture opening and the better the depth of field (the area in which the image is in focus), but the less light enters. Low ISO/ASA values mean lower sensitivity to light, but the images have better quality (are less grainy). Large aperture, small ISO and little light lead to long exposure times.

The longer the exposure time and the greater the zoom, the greater the risk of blurring the image. When taking wide-angle shots, you can hold the camera stable in your hand for about a tenth of a second, also depending on the weight of the camera and your own muscle strength. Some cameras have stabilization that allows for slightly longer times. For night shots you can place the camera on a railing, a wall or something similar; a tripod is even better. To prevent the camera from shaking when the shutter is released, you can use a delayed or remote shutter release. For long-term images of stars, as in the image below, tracking is necessary to compensate for the apparent rotation of the sky. This can be found on advanced astronomical telescope mounts.

Milky Way in Cygnus
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, Bilddiagonale

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