<P> Most often a prime lens will be used, both because the zoom is not necessary for posed shots (and primes are lighter, cheaper, faster, and higher quality), and because zoom lenses can introduce highly unflattering geometric distortion (barrel distortion or pincushion distortion). However, zoom lenses may be used, particularly in candid shots or to encourage creative framing . </P> <P> Portrait lenses are often relatively inexpensive, because they can be built simply, and are close to the normal range . The cheapest portrait lenses are normal lenses (50mm), used on a cropped sensor . For example, the Canon EF 50mm f / 1.8 II is the least expensive Canon lens, but when used on a 1.6 × cropped sensor yields an 80mm equivalent focal length, which is at the wide end of portrait lenses . </P> <P> The documentary I Am Chicago was an experiment in mobile full - body portraiture, using natural light and a moving truck as a studio . </P> <P> In North America, senior portraits are formal portraits taken of students at the beginning of their senior year of high school . </P>

Which of the following photographers is best known for making portraits