This tool helps photographers and videographers calculate the correct exposure settings based on light meter readings and scene conditions. It supports various camera formats and lighting scenarios for accurate shot planning. Use it to balance aperture, shutter speed, and ISO for your creative vision.
Light Meter Calculator
Calculate exposure settings from meter readings
Exposure Settings
How to Use This Tool
Enter your light meter reading in EV (Exposure Value) and your desired ISO. Select your aperture and shutter speed from the dropdowns, then choose your camera format and light type. Click Calculate to get recommended exposure settings. Use Reset to clear all fields.
Formula and Logic
The calculator uses the standard exposure equation: EV = log2(N²/t) + log2(ISO/100), where N is the f-number and t is shutter speed in seconds. It adjusts for crop factors based on camera format and estimates light intensity from the EV range. The tool balances aperture, shutter, and ISO to maintain consistent exposure.
Practical Notes
- Exposure Triangle: Changing one setting (aperture, shutter, ISO) requires adjusting others to maintain exposure.
- Crop Factors: APS-C sensors have a 1.5x crop factor, affecting field of view and effective aperture.
- Lighting Falloff: Intensity decreases with distance; use this tool for initial metering and adjust for subject distance.
- Storage Capacity: Higher ISO and faster shutter speeds may require more storage for RAW files; plan accordingly.
- White Balance: Different light types (tungsten, fluorescent) require white balance adjustments in post-processing.
Why This Tool Is Useful
This tool helps photographers quickly estimate exposure settings without a physical light meter, saving time on location. It supports various camera formats and lighting conditions, making it versatile for studio, outdoor, and event photography. The detailed breakdown aids in learning the exposure triangle and making creative decisions.
Frequently Asked Questions
What if my meter reading is outside the 0-20 EV range?
For extreme low-light (EV below 0) or very bright scenes (EV above 20), use manual mode and bracket exposures. This tool is optimized for typical photography scenarios.
How does camera format affect the results?
Crop factors change the effective field of view and depth of field. Full-frame sensors provide the widest view, while APS-C and Micro Four Thirds require adjusted aperture settings for equivalent exposure.
Can I use this for video exposure?
Yes, but video often uses fixed shutter speeds (e.g., 1/50s for 24fps). Adjust the shutter dropdown to match your frame rate and use the aperture/ISO recommendations for consistent video exposure.
Additional Guidance
For best results, meter from a mid-tone subject or use an 18% gray card. Practice with this tool to understand how EV relates to real-world lighting. Combine with histogram checks on your camera for precise exposure in challenging conditions.