I am willing to stand corrected if I am wrong, but my experience with the 18-55mm kit lens is that f5.6 at 55mm is wide open. I was really shocked at the drop off in sharpness from this lens in the supplied image. I am use to Nikon kit lenses producing surprising sharp results for what they are. But this lens needs replacing if the poster wants to get better images. The equipment is letting him down. The drop off was more pronounced near the edges suggesting this was not a focus problem or camera shake problem, but just a disappointing lens.
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