Lens Focal Length Comparison Calculator
Compare field of view and crop factors between different sensor formats and lens focal lengths
About this calculator
The Lens Focal Length Comparison Calculator helps photographers and videographers compare how different lens focal lengths perform across various camera sensor formats. It calculates equivalent focal lengths, field of view angles, and crop factors when switching between full-frame, APS-C, micro four-thirds, and other sensor sizes. This tool is essential for understanding how your existing lenses will behave on different camera bodies, planning lens purchases, or achieving consistent framing across multiple camera systems.
How to use
Select your current camera's sensor format and enter your lens focal length. Then choose the target sensor format you want to compare against. The calculator will instantly show you the equivalent focal length, field of view differences, and crop factor multiplier needed to achieve the same framing on the new sensor format.
Frequently asked questions
What is crop factor and why does it matter?
Crop factor is the ratio between full-frame and smaller sensors. It affects field of view, making lenses appear more telephoto on smaller sensors.
How do I match field of view between different cameras?
Multiply your current focal length by the crop factor ratio between sensor formats to find the equivalent focal length needed.
Does sensor size affect image quality or just field of view?
Sensor size affects both field of view and image characteristics like depth of field, low-light performance, and overall image quality.