Exposure Calculator
Convert light and illumination units with this free exposure calculator. Essential for photography and lighting design.
What Exposure Calculator does
The Exposure Calculator determines the equivalent exposure value (EV) from three camera settings: aperture, shutter speed, and ISO sensitivity. Users input their chosen parameters, and the tool returns an EV reading calibrated to ISO 100, along with a practical light-level description. This output helps photographers and videographers understand how changes in one setting affect the overall light captured, enabling them to balance motion blur, depth of field, and sensor sensitivity while keeping exposure consistent. The calculator also provides context by showing how ISO adjustments shift the required EV, making the exposure triangle easier to reason about. Results appear after entering aperture, shutter speed, and ISO values. Advertisement
How to use the Number Convert Exposure Calculator
- 1
Select an aperture value (f-number)
- 2
Choose a shutter speed (fraction or whole seconds)
- 3
Enter an ISO sensitivity value
- 4
View the calculated exposure value and light-level description
Best for
Photographers and videographers who need to compare equivalent exposure settings or identify the lighting conditions a specific camera setup fits, particularly when balancing motion blur, depth of field, and sensor sensitivity.
Limitations
- Results are estimates based on standard EV relationships
- ISO is treated as a sensitivity change, not additional light
- Shutter speed values must be interpreted correctly (fractions vs. full seconds)
Exposure Calculator FAQ
- How does the Exposure Calculator determine the exposure value?
- The tool uses the standard EV relationship: EV100 = log2(f-number² / shutter speed). It calculates the exposure value based on the entered aperture, shutter speed, and ISO, then normalizes the result to ISO 100 for comparison with reference tables.
- Can I use the Exposure Calculator to compare different camera settings?
- Yes, the calculator allows users to input various combinations of aperture, shutter speed, and ISO to see equivalent exposure values. This helps identify settings that produce the same overall exposure, useful for balancing motion blur, depth of field, and sensor sensitivity.
- What does the exposure value (EV) reading represent?
- The exposure value represents a standardized measure of light levels. One EV step equals one stop of light. The main EV reading shown is calibrated to ISO 100, allowing users to compare their camera setup against common exposure-value reference tables.
- Why does the calculator normalize the EV to ISO 100?
- Normalizing to ISO 100 allows for consistent comparison across different camera setups and ISO settings. It provides a baseline exposure value that can be referenced against standard exposure tables, regardless of the ISO sensitivity used during shooting.
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