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Photographers must adjust their aperture, shutter speed, and ISO (collectively, exposure settings) to produce an image that is not too light (overexposed) or too dark (underexposed). With a proper exposure, there is a full range of tones from light to dark, detail in the highlights and shadows, and good image color. Exposure settings can also be used for creative effect using a fast shutter speed can freeze motion, while using a slow shutter speed can produce an artistic blur. A wide aperture (large lens opening) is used to limit the image area, from front to back, that appears sharp (this can make the subject stand out); a narrow aperture (small opening) is used to record everything the lens sees” as tack-sharp. With judicious use of these controls and, in some cases, the introduction of flash to bring up the light levels, photographers have the tools needed to craft powerful portraits and capture the majesty of nature.
Curley Marshall is an award-winning photographer in the Houston area specializing in weddings, seniors, executives, fashion, and family portraits. He is a photography/Photoshop instructor at San Jacinto College in Houston, TX. He is a member of the Professional Photographers’ Guild of Houston, the American Society of Photographers, and Professional Photographers of Texas. He has earned his Certified Professional Photographer (CPP) degree from Professional Photographers of America (PPA).