1. What is Camera Exposure?

Exposure is a relative value that represents the amount of light reaching the camera sensor, determined by the combination of aperture, shutter speed, and ISO sensitivity. It helps photographers balance these three elements for proper image brightness.

2. How Does the Exposure Calculator Work?

The calculator uses the exposure equation:

Where:

• \( Aperture \) — The f-number (e.g., f/2.8)
• \( Shutter\ Speed \) — Duration the shutter is open (seconds)
• \( ISO \) — Sensor sensitivity (e.g., 100, 400, 1600)

Explanation: The equation shows how these three factors combine to determine the total light reaching the sensor. Higher values indicate more light exposure.

3. Importance of Exposure Calculation

Details: Understanding exposure helps photographers achieve proper image brightness while balancing depth of field (aperture), motion blur (shutter speed), and noise (ISO).

4. Using the Calculator

Tips: Enter aperture as f-number (e.g., 2.8 for f/2.8), shutter speed in seconds (e.g., 1/250 = 0.004), and ISO value. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is a "good" exposure value?
A: There's no single good value - it depends on lighting conditions. The calculator helps compare relative exposures between different settings.

Q2: How does this relate to exposure stops?
A: Each doubling of exposure value equals one stop increase in light. The calculator helps visualize these relationships numerically.

Q3: Why square the aperture?
A: The f-number is a ratio of focal length to aperture diameter, but light gathering depends on area (diameter squared).

Q4: Why divide ISO by 100?
A: This normalizes to ISO 100 as the baseline sensitivity for comparison.

Q5: Can this predict image brightness?
A: It gives relative values - actual brightness also depends on scene luminance and camera metering.