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On less-expensive zooms, the lens gets slower as you move to longer focal lengths. On an 1855mm f/3.55.6 lens, for instance, you can set an aperture as big as f/3.5 at 18mm, but at 55mm the widest you can set is f/5.6. At an intermediate focal lengthsay, 35mmthe maximum aperture will be around f/4.5.
