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A digital single-lens reflex camera (also called a digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.
DSLRs all contain a sensor to capture an image. The dynamic range of a sensor is defined by the largest possible signal that it can generate divided by the smallest possible signal.A signal is generated by the process of the camera's image sensor's pixels capturing photons, which then are turned into an electrical charge.his means that cameras with a larger dynamic range are able to capture both highlight and shadow detail simultaneously. By shooting in RAW, the dynamic range of the sensor is preserved, whereas JPEGs may clip the details. As already stated, pixels on the sensor collect photons during exposure of an image.