Exposure Calculator
How the Exposure Calculator Works
This Exposure Calculator offers a simple way to determine the optimal exposure settings for your photographic needs. Here's a step-by-step breakdown:
- Shutter Speed: Input the desired time (in seconds) the camera shutter will be open to capture the image.
- ISO: This represents your camera sensor's sensitivity to light. A higher ISO means the camera is more sensitive to light and can capture images in lower-light conditions, but might result in more noise.
- Aperture (f/stop): Choose from the dropdown the size of the lens opening. Lower f-numbers let in more light and create a shallower depth of field, while higher f-numbers provide a deeper depth of field and less light.
- Exposure Value (EV) Description: As you adjust or input these settings, the calculator will instantly compute the Exposure Value (EV) for you. The EV is a number that represents the combination of shutter speed, ISO, and aperture. For instance, an EV of -6 might correspond to a "Nighttime landscape under quarter moon". The full list of these EVs is below.
Behind the scenes, the script computes the EV using the formula:
EV = -log2((ISO x ShutterSpeed) / (100 x Aperture^2))
It then maps this EV to a description, making it easier for you to understand the kind of light scenario your settings are suited for.
The full list of Exposure Values are:
| Exposure Value (EV) | Description |
|---|---|
| -6 | Nighttime landscape under quarter moon |
| -5 | Aurora borealis of moderate brightness |
| -4 | Nighttime landscape under gibbous moon |
| -3 | Nighttime landscape under full moon |
| -2 | Nighttime snow or beach landscape under full moon |
| -1 | End of blue hour |
| 0 | Late in blue hour |
| 1 | Middle of blue hour |
| 2 | Distant cityscape at night |
| 3 | Indoor scene lit only by dim window light |
| 4 | Floodlit monuments or fountains at night |
| 5 | Typical artificial indoor light |
| 6 | Bright indoor lighting |
| 7 | Fairs and theme parks at night |
| 8 | Bright window displays and advertisements at night |
| 9 | Nighttime sporting events under bright light |
| 10 | Moment after sunset on a clear day |
| 11 | Daylight on a foggy day |
| 12 | Moment before sunset on a clear day |
| 13 | Typical subject on a bright, cloudy day |
| 14 | Typical subject on a day with hazy sunlight |
| 15 | Full sunlight on a cloudless day, typical subject |
| 16 | Full sunlight on a cloudless day, bright subject (i.e. the beach) |
| 17 | Full sunlight on a cloudless day, highly reflective subject (i.e. snow) |
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