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That is the aperature range. The 4.5 aperature is the largest aperature at 55mm. The 5.6 aperature is the largest aperature at 300mm. The smaller the number the more light your lens will let in.
Sorry, there was a problem. Please try again later.f4.5-f5.6 indicates the lens' maximum aperture. This is a variable aperture lens so at the 55mm view setting the lens' max aperture is f4.5. As you zoom the lens' maximum becomes f5.6
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