![]() The narrower angle of view gives the impression of using a longer focal length. Because they're physically smaller, they capture a smaller area of the projected image, resulting in a photo which covers a narrower angle of view.Ī cropped sensor captures less of the projected image. Film has been replaced by sensors which are usually smaller than 35mm film. This meant that they all captured the same portion of the projected image, resulting in the same photo for a given lens.ĭigital cameras have complicated things somewhat. ![]() ![]() In the days before digital photography, all SLR cameras used 35mm film. When the image hits the film or sensor, a rectangular portion is recorded. For a particular lens, this image is the same regardless of what camera it's mounted on. When you fit a lens to a camera, it projects a circular image towards the back of the camera. Once you understand it, you'll be able to make more informed choices when selecting which lens to use, or when buying equipment. It's mainly used as a way of comparing lens focal lengths when fitted to different cameras, which is more important than it sounds.Īlthough crop factor seems complicated, it's not as hard as you might think, and it's an important and useful concept to grasp. ![]() Crop factor is a term that describes the difference between your camera's sensor size and a traditional 35mm film frame. ![]()
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