Equivalent Aperture Calculator

What is Equivalent Aperture?

Equivalent aperture is a way to compare the light-gathering ability of cameras with different sensor sizes while using the same focal length. It allows photographers to understand how a lens will perform on different camera formats.

How to Use This Calculator

1. Enter the focal length of your lens in millimeters (mm).
2. Enter the sensor height of your camera in millimeters (mm). You can find this information in your camera's specifications.
3. Click the Calculate button to see the equivalent aperture.
4. Use the Reset button to clear all inputs and start over.

Example Usage

For example, if you have a 50mm lens on a full-frame camera (sensor height ≈ 24mm) and want to know what focal length you would need on a Micro Four Thirds camera (sensor height ≈ 17.3mm) to achieve the same field of view, you can calculate the equivalent aperture and compare.

Why is This Useful?

Understanding equivalent aperture helps when:

• Comparing lenses between different camera systems
• Planning lens purchases for specific shooting scenarios
• Understanding depth of field differences between formats
• Comparing exposure settings across cameras with different sensors