Crop factor is the ratio of the camera sensor size to what the lens can see. DSLRA digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex (SLR) camera with a digital imaging sensor. The reflex design scheme is the primary difference between a DSLR and other digital cameras. In the reflex design, light travels through the lens and then to a mirror that alternates to send the image to either the viewfinder or the image sensor. The viewfinder of a DSLR presents an image that will not differ substantially from what is captured by the camera's sensor but presents it as a direct optical view through the lens, rather than being captured by the camera's image sensor and displayed by a digital screen. DSLR is often (wrongly) used to describe cameras that are Micro Four Thirds or Bridge Camera - just because they look similar. This can bee seen when cameras are offered for sale. cameras often have multiple sensors of varying sizes to control for distortions that come from crop factor. It describes the difference between your camera's sensor size and a traditional 35mm film frame. It's mainly used as a way of comparing lens focal lengths when fitted to different cameras. A cropped sensor captures less of the projected image. The narrower angle of view gives the impression of using a longer focal lengthThe optical distance in millimetres between a camera lens and the film (or sensor on a digital camera). It determines the height and width of the scene being captured, known as the field of view.. For micro four thirds this is two times. For example, a 50mm for a 35mm camera is equivelent to a 25mm micro four thirds lens.
