Calculate equivalent focal length based on camera sensor crop factor.
Lens & Sensor
Equivalency
Equivalent Focal Length76.5mmon Full Frame body
Computed Crop Factor1.53xMultiplier relative to 35mm format
Note that depth of field also changes. To get equivalent DoF, you must also multiply your f-stop by the crop factor.
Overview
Crop factor compares sensor size to full-frame (35mm). Smaller sensors 'crop' the image, effectively increasing focal length. Essential for understanding field of view across different camera systems.
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Pro Tips
APS-C crop factor: 1.5× (Nikon/Sony) or 1.6× (Canon).
Micro Four Thirds has 2× crop factor.
Full-frame = 1× (no crop, baseline reference).
Crop affects focal length, not aperture or depth of field.
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Fun Facts
"Full-frame sensors are 36×24mm (same as 35mm film)."
"APS-C sensors are about 40% smaller than full-frame."
"Crop sensors gain telephoto reach but lose wide-angle."
"Medium format cameras have crop factor less than 1 (0.79×)."
