Focal Length Comparison Calculator – Compare Different Camera Systems

Compare equivalent focal lengths across different camera systems using crop factors with our free focal length comparison calculator. Convert focal lengths between smartphones, APS-C, Micro Four Thirds, and Full Frame sensor formats. This camera system comparison tool is essential for photographers switching systems or comparing smartphone camera specs to understand what each focal length truly sees in real-world field of view terms.

Focal Length Comparison

Compare focal lengths across different sensor systems

Focal Length 1 (mm) Please enter a valid value

Crop Factor 1 Please enter a valid value

Focal Length 2 (mm) Please enter a valid value

Crop Factor 2 Please enter a valid value

Crop factors: Full Frame=1, APS-C=1.5-1.6, M4/3=2, Smartphone≈7

—Camera 1 Equivalent

—Camera 2 Equivalent

—Difference

Focal Length Comparison Calculator Features

Compares equivalent focal lengths between two different camera systems using crop factor
Accepts focal length and crop factor for both cameras simultaneously
Provides crop factor reference values for Full Frame, APS-C, Micro 4/3, and smartphones
Displays 35mm equivalent focal length for each camera system
Shows the focal length difference between the two systems in millimeters
Useful for understanding field-of-view equivalence when switching camera systems

How to Use Focal Length Comparison Calculator

Enter the focal length of camera 1 in mm (e.g., 26) in the “Focal Length 1” field
Enter the crop factor of camera 1 (e.g., 7 for smartphone) in the “Crop Factor 1” field
Enter the focal length of camera 2 in mm (e.g., 50) in the “Focal Length 2” field
Enter the crop factor of camera 2 (e.g., 1.5 for APS-C) in the “Crop Factor 2” field
Refer to the hint text for typical crop factors of each camera system
Click the Calculate button
View the 35mm equivalent for each camera and the difference between them in the results
Click Reset to compare a different pair of camera systems

Frequently Asked Questions

What is crop factor in cameras?

Crop factor is the ratio of a camera’s sensor size relative to 35mm full frame. APS-C has a 1.5–1.6× crop factor. Micro Four Thirds: 2×. Smartphone sensors: typically 5–9×. Multiply focal length by crop factor to get full-frame equivalent.

How do I convert smartphone focal length to full-frame equivalent?

Full-Frame Equivalent = Actual Focal Length × Crop Factor. A smartphone’s 5mm lens with a 7× crop factor = 35mm full-frame equivalent — equivalent to a standard portrait lens.

Why do we use full-frame equivalent focal lengths?

Full-frame equivalents provide a common reference point for comparing field of view across different camera systems, since the physical focal length alone doesn’t indicate field of view without knowing sensor size.

What crop factor does an iPhone have?

iPhone main cameras are approximately 26mm full-frame equivalent with a physical focal length around 5.5–6.86mm, suggesting a crop factor of approximately 3.8–4.7×, varying by model generation.

What crop factor does the APS-C sensor have?

Canon APS-C sensors have a 1.6× crop factor. Nikon, Sony, Fujifilm, and Samsung APS-C sensors use a 1.5× crop factor. Always check the specific camera’s sensor specification for exact values.

Is a higher crop factor better or worse?

Neither — it’s a tradeoff. Higher crop factor (smaller sensor) can be beneficial for telephoto reach but disadvantageous for wide-angle photography and low-light performance compared to larger sensor formats.

Can I use this calculator to compare smartphone camera equivalents?

Yes! Enter the smartphone’s actual lens focal length and sensor crop factor to see what full-frame equivalent focal length it represents. This makes cross-platform camera system comparison meaningful and accurate.

Focal Length Comparison Calculator – Compare Different Camera Systems