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On digital cameras, electronic compensation for the color temperature associated with a given set of lighting conditions, ensuring that white light is registered as such on the imaging chip and therefore that the colors in the frame will appear natural. On mechanical, film-based cameras, this function is served by the operator's choice of film stock or with color correction filters. In addition to using white balance to register natural coloration of the image, photographers may employ white balance to aesthetic end, for example white balancing to a blue object in order to obtain a warm color temperature.
Adjustment of the speed (often expressed either as fractions of seconds or as an angle, with mechanical shutters) of the shutter to control the amount of time during which the imaging medium is exposed to light for each exposure. Shutter speed may be used to control the amount of light striking the image plane; 'faster' shutter speeds (that is, those of shorter duration) decrease both the amount of light and the amount of image blurring from motion of the subject and/or camera.
Adjustment of the iris measured as f-number, which controls the amount of light passing through the lens. Aperture also has an effect on focus and depth of field, namely, the smaller the opening aperture, the less light but the greater the depth of field--that is, the greater the range within which objects appear to be sharply focused. The current focal length divided by the f-number gives the actual aperture size in millimeters.
Some photography instructors have recommended starting out by trying to be stealthy and using long lenses. Others suggest bypassing such crutches, instead leaping into the "deep end of the pool" and heading into the street with a normal or wide-angle lens. Sometimes using an extreme wide angle lens and appearing to be pointing the camera somewhere other than at the subject can help, but at the expense of direct involvement with the action. Other photographers stand at one spot on the street and wait for the proper subject to appear. This was done most notably by Philip Lorca di Corcia who actually has set up elaborate strobe rigs on street corners in advance of unknown action. Magnum Photos photographer Bruce Gilden's famously direct method of just suddenly walking up to people in New York at close range with a powerful strobe shows that the demeanor of the photographer before and after the moment of exposure is a key element to interaction on the street, with the latter more important. Gilden has claimed to have never suffered an aggressive response. Gilden also has said, "The older I get, the closer I get," showing that experience is often the key to overcoming shyness.
