Sigma 70-300mm F4-5.6 DG Macro

Telephoto zoom lens | Canon EF, Nikon F (FX), Pentax KAF, Sigma SA Bayonet, Sony/Minolta Alpha
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Does the lens above have manual aperture? I mean the little lever (or something like that) that you can push to adjust the aperture. I have one but I am not really sure how to find out, because I don't seem to see it anywhere. So I am asking you, professionals, I would like to buy extension tube for macro photography but I don't want to pay an arm and a leg for electrical models.
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