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Re: wide open aperture, if you're using a long enough telephoto lens then the background will be out of focus anyway, if you open too wide (f-number lower) then the subject is also more likely to be out of focus.
Were you up against the chain link fence or was it further away? If you're up against it, try resting the lens hood on the fence, closest to a diamond opening, and then rotate the camera around to aim.
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