Concept explainers
A 135 mm telephoto lens for a 35 mm camera has f-stops that range from f/2.8 to f/22. (a) What are the smallest and largest aperture diameters for this lens? What is the diameter at f/11? (b) If a 50 mm lens had the same f-stops as the telephoto lens, what would be the smallest and largest aperture diameters for that lens? (c) At a given shutter speed, what is the ratio of the greatest to the smallest light intensity of the film image? (d) If the shutter speed for correct exposure at f/22 is 1/30 s. what shutter speed is needed at f/2.8? Calculate m1 and M2 for the two lenses and do not make the approximation that leads to Equation 25.4.
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