Crop factor compares your camera’s sensor size to full frame (35mm format, 36×24mm). A smaller sensor captures a smaller central portion of the image projected by the lens, so the scene looks more “zoomed in” even though the lens focal length itself has not changed.

Example: on a 1.6× crop camera, a 50mm lens gives the same field of view as an 80mm lens on full frame (50 × 1.6 = 80). That does not mean the lens becomes an 80mm lens—it only means the framing is equivalent.

What changes:

• Field of view: narrower on smaller sensors
• Framing: appears tighter or cropped in

What does not change:

• Actual focal length of the lens
• Perspective, if you shoot from the same position

A simple way to think about it: the lens projects the same image circle, but a smaller sensor records less of it. If images from different sensor sizes are displayed at the same final size, the smaller-sensor image must be enlarged more, which is why it appears like a crop of the full-frame image.