Calculate the equivalent focal length by multiplying the focal length with the crop factor.

Equivalent Focal Length Calculator

Purpose

The Equivalent Focal Length Calculator is used to determine the equivalent focal length for different crop factors based on sensor size.

Use Cases

• Photography enthusiasts who want to understand how different crop factors affect the focal length of their lenses.
• Professionals looking to calculate the equivalent focal length for different sensor sizes.

How to Use

1. Enter the focal length of your lens in millimeters.
2. Select the crop factor based on your sensor size.
3. Click on the calculate button to see the equivalent focal length.

Input Values

1. Focal Length (default unit is millimeters): The focal length of your lens.
2. Crop Factor: The ratio of the diagonal of a full-frame sensor to the diagonal of the sensor in question.

Output Values

1. Equivalent Focal Length (unit: millimeters): The calculated equivalent focal length for the given crop factor.

Any other Instructions

• Ensure to input the correct focal length and select the appropriate crop factor for accurate results.
• The calculated equivalent focal length will help you understand how your lens behaves on different sensor sizes.

Calculation Steps

1. Convert the input focal length to millimeters.
2. Multiply the focal length by the selected crop factor.
3. Return the calculated equivalent focal length in millimeters.

Technical Parameters

• focal_length, crop_factor

Return Values

• Equivalent Focal Length

Example Expressions

You can use the following expressions to directly evaluate in a non-interactive manner using eval():

equivalent_focal_length('50 mm', 1.5)
equivalent_focal_length('35 mm', 1.2)

Click on Help icon to open the help page on a separate window.