# Photo light calculator

### Camera settings

• Aperture: `f/3.5` - average aperture, could be cheap kit lens
• Shutter: `2` sec - long exposure, needs tripod
• ISO: `400` ASA - low ISO, little noise
• No Neutral Density filter
• ### Scene lighting: EV0.6

 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 starlight to dim ambient light moon eclipse to night home interior neon lights to landscape after sunset bright light to weak sun bright daylight to direct sunlight
• Pure Exposure Value: EV100 = `2.61` (based on shutter & aperture)
• APEX Exposure Value: EV400 = `0.61` (based on shutter, aperture, ISO)
• Luminance: `0.1895 cd/m²` = `0.0176 cd/ft²`
• Luminance: `0.0553 fL` (foot Lambert)

### Explanation

• Explanation: EV is an estimation of how much light you need for a decent photo with these settings.
• This can be natural light (sun, moon), artificial continuous light (lamps) or strobes.
• If your camera settings indicate EV10 and you actually have EV=15 in your scene, your photo will be overexposed. If your settings need EV=10 and you actually have EV=3 your photo will be underexposed.