Camera Crop Factor
Equivalent focal length and aperture across sensor sizes.
Reading the equivalents
A 50mm f/1.8 on APS-C frames like a 75mm f/2.7 on full frame in terms of field of view and depth of field. The exposure (light per square mm of sensor) doesn't change, just framing and DOF.
Crop factor compares your sensor's diagonal to a 35mm full frame's. A 1.5× APS-C sensor sees the central crop of what a 35mm sensor would see, so the same lens "looks longer". Aperture equivalents matter for depth of field math, not exposure.
About
Enter focal length and aperture. Pick a sensor (APS-C, micro four thirds, 1-inch, etc). Get the 35mm equivalent focal length, equivalent aperture (for depth of field), and field of view in degrees.
How to use
- Enter focal length and aperture.
- Pick sensor type.
- Read 35mm equivalent.
FAQ
Does crop factor affect exposure?+
Not directly. The light per square mm of sensor is the same, so the exposure (ISO, shutter, f-stop) doesn't change. Crop factor only affects framing and depth of field equivalence.