Exposure Calculator

Aperture
f /

Exposure Time
s

Sensitivity
ISO

Exposure Value
EV₁₀₀ =


Lock

Round to nearest third-stop.

How to use:

1. Enter the camera settings for a known exposure.
2. Lock the exposure.
3. Tweak indivdual settings, watch the others adjust to keep exposure consistent.
4. Use keyboard shortcuts to get around quicker: A, T, S, L, ↑, ↓.

Information:

• EV = log2(N2 / t) where N = f-number and t = exposure time in seconds.
• EVS = EV100 + log2(S / 100) where S = desired ISO.
• I wrote this tool to plan long exposures outside my camera's typical range.
• Get more background on exposure and camera settings from Fred Parker.
• Useful wikipedia articles:
  • Exposure Value
  • Shutter Speed
  • F-Number (Aperture)
  • Sunny f/16 rule

Copyright ©2011 Daniel Pupius. All rights reserved.