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f4 - 5.6 is the widest aperture you can use, f4 at 10mm zoom but it changes to f5.6 at 20mm zoom, you can use all the other f-stops it's just they print the widest ones available on the lens
more expensive lenses have the ability to use f4 (or whatever is the widest setting)all the way through the zoom range but cheaper lenses use cheaper glass/components and can't do this.
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